2 Corinthians 4:2

But have renounced the hidden things of dishonesty, not walking in craftiness, nor handling the word of God deceitfully; but by manifestation of the truth commending ourselves to every man's conscience in the sight of God. {dishonesty: Gr. shame}

2 Corinthians 1:12

For our rejoicing is this, the testimony of our conscience, that in simplicity and godly sincerity, not with fleshly wisdom, but by the grace of God, we have had our conversation in the world, and more abundantly to you-ward.

2 Peter 2:1-3

But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.

2 Timothy 4:3-4

For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears;

1 Timothy 4:1-3

Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;

Matthew 24:24

For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if {it were} possible, they shall deceive the very elect.

1 Corinthians 5:8

Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened {bread} of sincerity and truth. {the feast: or, holyday}

Revelation 2:20

Notwithstanding I have a few things against thee, because thou sufferest that woman Jezebel, which calleth herself a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed unto idols.