Study all the scriptures - from Gen. to Rev. People in the scriptures did.

John.4 [22] Ye worship ye know not what: we know what we worship: for salvation is of the Jews

Rom.3[1] What advantage then hath the Jew? or what profit is there of circumcision?[2] Much every way: chiefly, because that unto them were committed the oracles of God.

Acts.10 [43] To him give all the prophets witness, that through his name whosoever believeth in him shall receive remission of sins.

Matt.5[17] Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.

Matt.22 [37] Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
[38] This is the first and great commandment.
[39] And the second is like unto it, Thou shalt love thy neighbour as thyself.
[40] On these two commandments hang all the law and the prophets.

Luke.24[14] But this I confess unto thee, that after the way which they call heresy, so worship I the God of my fathers, believing all things which are written in the law and in the prophets:[15] And have hope toward God, which they themselves also allow, that there shall be a resurrection of the dead, both of the just and unjust.[25] Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken:[26] Ought not Christ to have suffered these things, and to enter into his glory?[27] And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself. [44] And he said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me

John.1 [45] Philip findeth Nathanael, and saith unto him, We have found him, of whom Moses in the law, and the prophets, did write, Jesus of Nazareth, the son of Joseph.

John.3[14] And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up:

John.5[45] Do not think that I will accuse you to the Father: there is one that accuseth you, even Moses, in whom ye trust. [46] For had ye believed Moses, ye would have believed me: for he wrote of me.

Acts.3 [18] But those things, which God before had shewed by the mouth of all his prophets, that Christ should suffer, he hath so fulfilled. [21] Whom the heaven must receive until the times of restitution of all things, which God hath spoken by the mouth of all his holy prophets since the world began. [24] Yea, and all the prophets from Samuel and those that follow after, as many as have spoken, have likewise foretold of these days.[22] For Moses truly said unto the fathers, A prophet shall the Lord your God raise up unto you of your brethren, like unto me; him shall ye hear in all things whatsoever he shall say unto you.

Acts.26[22] Having therefore obtained help of God, I Paul, continue unto this day, witnessing both to small and great, saying none other things than those which the prophets and Moses did say should come:[23] That Christ should suffer, and that he should be the first that should rise from the dead, and should shew light unto the people, and to the Gentiles.

Acts.28:23 And when they had appointed him a day, there came many to him into his lodging; to whom he expounded and testified the kingdom of God, persuading them concerning Jesus, both out of the law of Moses, and out of the prophets, from morning till evening.

Matt.2 [23] And he came and dwelt in a city called Nazareth: that it might be fulfilled which was spoken by the prophets, He shall be called a Nazarene.

Matt.11:13 For all the prophets and the law prophesied until John.

Matt.26 [56] But all this was done, that the scriptures of the prophets might be fulfilled. Then all the disciples forsook him, and fled.

Mark.1 [2] As it is written in the prophets, Behold, I send my messenger before thy face, which shall prepare thy way before thee.

Luke.1[67] And his father Zacharias was filled with the Holy Ghost, and prophesied, saying,
[68] Blessed be the Lord God of Israel; for he hath visited and redeemed his people,
[69] And hath raised up an horn of salvation for us in the house of his servant David;
[70] As he spake by the mouth of his holy prophets, which have been since the world began:
[71] That we should be saved from our enemies, and from the hand of all that hate us;
[72] To perform the mercy promised to our fathers, and to remember his holy covenant;
[73] The oath which he sware to our father Abraham,
[74] That he would grant unto us, that we being delivered out of the hand of our enemies might serve him without fear,
[75] In holiness and righteousness before him, all the days of our life.

Luke.18 [31] Then he took unto him the twelve, and said unto them, Behold, we go up to Jerusalem, and all things that are written by the prophets concerning the Son of man shall be accomplished

Acts.7[42] Then God turned, and gave them up to worship the host of heaven; as it is written in the book of the prophets, O ye house of Israel, have ye offered to me slain beasts and sacrifices by the space of forty years in the wilderness?

Acts.15:13 And after they had held their peace, James answered, saying, Men and brethren, hearken unto me:[14] Simeon hath declared how God at the first did visit the Gentiles, to take out of them a people for his name.[15] And to this agree the words of the prophets; as it is written,[16] After this I will return, and will build again the tabernacle of David, which is fallen down; and I will build again the ruins thereof, and I will set it up:[17] That the residue of men might seek after the Lord, and all the Gentiles, upon whom my name is called, saith the Lord, who doeth all these things.[18] Known unto God are all his works from the beginning of the world.

Rom.1[1] Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God,[2] (Which he had promised afore by his prophets in the holy scriptures,)
[3] Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh;[4] And declared to be the Son of God with power, according to the spirit of holiness, by the resurrection from the dead:
Rom.16[24] The grace of our Lord Jesus Christ be with you all. Amen.
[25] Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,
[26] But now is made manifest, and by the scriptures of the prophets, according to the commandment of the everlasting God, made known to all nations for the obedience of faith:
[27] To God only wise, be glory through Jesus Christ for ever. Amen.

Eph.3:[1] For this cause I Paul, the prisoner of Jesus Christ for you Gentiles,
[2] If ye have heard of the dispensation of the grace of God which is given me to youward:
[3] How that by revelation he made known unto me the mystery; (as I wrote afore in few words,
[4] Whereby, when ye read, ye may understand my knowledge in the mystery of Christ)
[5] Which in other ages was not made known unto the sons of men, as it is now revealed unto his holy apostles and prophets by the Spirit;
[6] That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel:

Rev.10 [7] But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.

Heb.1[1] God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets,
[2] Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds;
Heb.11[32] And what shall I more say? for the time would fail me to tell of Gedeon, and of Barak, and of Samson, and of Jephthae; of David also, and Samuel, and of the prophets:

Jas.5 [10] Take, my brethren, the prophets, who have spoken in the name of the Lord, for an example of suffering affliction, and of patience.

1Pet.1[10] Of which salvation the prophets have inquired and searched diligently, who prophesied of the grace that should come unto you:

2Pet.3[2] That ye may be mindful of the words which were spoken before by the holy prophets, and of the commandment of us the apostles of the Lord and Saviour:

Rev.22[6] And he said unto me, These sayings are faithful and true: and the Lord God of the holy prophets sent his angel to shew unto his servants the things which must shortly be done.

[9] Then saith he unto me, See thou do it not: for I am thy fellowservant, and of thy brethren the prophets, and of them which keep the sayings of this book: worship God.