Satan
Romans 7:13-15 (NASB) 13 Therefore did that which is good become a cause of death for me? May it never be! Rather it was sin, in order that it might be shown to be sin by effecting my death through that which is good, so that through the commandment sin would become utterly sinful. 14 For we know that the Law is spiritual, but I am of flesh, sold into bondage to sin. 15 For what I am doing, I do not understand; for I am not practicing what I would like to do, but I am doing the very thing I hate.
1 Timothy 6:5 (NASB) 5 and constant friction between men of depraved mind and deprived of the truth, who suppose that godliness is a means of gain.
1 Timothy 6:9 (NASB) But those who want to get rich fall into temptation and a snare and many foolish and harmful desires which plunge men into ruin and destruction.
1 Peter 5:7 (NASB) casting all your anxiety on Him, because He cares for you.
Ephesians 2:2 (NASB) 2 in which you formerly walked according to the course of this world, according to the prince of the power of the air, of the spirit that is now working in the sons of disobedience.
Ephesians 2:3 (NASB) Among them we too all formerly lived in the lusts of our flesh, indulging the desires of the flesh and of the mind, and were by nature children of wrath, even as the rest.
Ephesians 6:12 (NASB) For our struggle is not against flesh and blood, but against the rulers, against the powers, against the world forces of this darkness, against the spiritual forces of wickedness in the heavenly places.
1 John 2:16 (NASB) For all that is in the world, the lust of the flesh and the lust of the eyes and the boastful pride of life, is not from the Father, but is from the world.
1 Timothy 4:1 (NASB) But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons,
Galatians 6:7 (NASB) 7 Do not be deceived, God is not mocked; for whatever a man sows, this he will also reap.
Galatians 6:8 (NASB) For the one who sows to his own flesh will from the flesh reap corruption, but the one who sows to the Spirit will from the Spirit reap eternal life.