Do not be deceived, God is not mocked; for whatever a man sows, this he will also reap. For the one who sows to his own flesh shall from the flesh reap corruption, but the one who sows to the Spirit shall from the Spirit reap eternal life. (Galatians 6:7-8).
Little children, let no one deceive you; the one who practices righteousness is righteous, just as He is righteous; the one who practices sin is of the devil; for the devil has sinned from the beginning. The Son of God appeared for this purpose, that He might destroy the works of the devil. No one who is born of God practices sin, because His seed abides in him; and he cannot sin, because he is born of God. (1 John 3:7-9).
Or do you not know that the unrighteous shall not inherit the kingdom of God? Do not be deceived; neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor homosexuals, nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers shall inherit the kingdom of God. (1 Corinthians 6:9-10).
Do not be deceived: “Bad company corrupts good morals.” (1 Corinthians 15:3).
See also 2 Thessalonians 2:8-12.