Jn 8:44, 2 Cor 4:4
In the Old Testament, evil spirits deceived the Israelites and deceived them so that they could not believe in God. (1 Kings 22:22)
1 Kings 22:22 And the Lord said unto him, Wherewith? And he said, I will go forth, and I will be a lying spirit in the mouth of all his prophets. And he said, Thou shalt persuade him, and prevail also: go forth, and do so.
Satan is the spirit of lies, deceiving people's hearts so that they cannot believe that Jesus is the Christ. (John 8:44, 2 Corinthians 4:4)
John 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.
2 Corinthians 4:4 In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.