Jesus said satan was cast out and is on this earth with a 3rd part of the stars of heaven

Luke.10[18] And he said unto them, I beheld Satan as lightning fall from heaven.

Rev.12 [12] Therefore rejoice, ye heavens, and ye that dwell in them. Woe to the inhabiters of the earth and of the sea! for the devil is come down unto you, having great wrath, because he knoweth that he hath but a short time.

1Pet.5 [8] Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour:

Rev.12 3] And there appeared another wonder in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads.[4] And his tail drew the third part of the stars of heaven, and did cast them to the earth: and the dragon stood before the woman which was ready to be delivered, for to devour her child as soon as it was born.

Eph.6:[10] Finally, my brethren, be strong in the Lord, and in the power of his might.
[11] Put on the whole armour of God, that ye may be able to stand against the wiles of the devil.
[12] For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
[13] Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand.
[14] Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness;
[15] And your feet shod with the preparation of the gospel of peace;
[16] Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked.
[17] And take the helmet of salvation, and the sword of the Spirit, which is the word of God:

2Cor.11 [14] And no marvel; for Satan himself is transformed into an angel of light.[15] Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works.
1Chr.21 [1] And Satan stood up against Israel, and provoked David to number Israel.

Job.1 [6] Now there was a day when the sons of God came to present themselves before the LORD, and Satan came also among them.

[7] And the LORD said unto Satan, Whence comest thou? Then Satan answered the LORD, and said, From going to and fro in the earth, and from walking up and down in it.

[8] And the LORD said unto Satan, Hast thou considered my servant Job, that there is none like him in the earth, a perfect and an upright man, one that feareth God, and escheweth evil?

[9] Then Satan answered the LORD, and said, Doth Job fear God for nought?

[12] And the LORD said unto Satan, Behold, all that he hath is in thy power; only upon himself put not forth thine hand. So Satan went forth from the presence of the LORD.

Job.2 [1] Again there was a day when the sons of God came to present themselves before the LORD, and Satan came also among them to present himself before the LORD. [2] And the LORD said unto Satan, From whence comest thou? And Satan answered the LORD, and said, From going to and fro in the earth, and from walking up and down in it. [3] And the LORD said unto Satan, Hast thou considered my servant Job, that there is none like him in the earth, a perfect and an upright man, one that feareth God, and escheweth evil? and still he holdeth fast his integrity, although thou movedst me against him, to destroy him without cause. [4] And Satan answered the LORD, and said, Skin for skin, yea, all that a man hath will he give for his life. 6] And the LORD said unto Satan, Behold, he is in thine hand; but save his life. [7] So went Satan forth from the presence of the LORD, and smote Job with sore boils from the sole of his foot unto his crown.