“Error is like leaven, of which we read, ‘A little leaven leaveneth the whole lump.’ Truth mixed with error is equivalent to all error, except that it is more innocent looking and, therefore, more dangerous. God hates such a mixture! Any error, or any truth-and-error mixture, calls for definite exposure and repudiation. To condone such is to be unfaithful to God and His Word and treacherous to imperiled souls for whom Christ died.
— H.A. Ironside
1 Corinthians 5:6 Your glorying is not good. Know ye not that a little leaven leaveneth the whole lump?
1 Corinthians 15:33 Be not deceived: evil communications corrupt good manners.
Ephesians 5:10-11 Proving what is acceptable unto the Lord. And have no fellowship with the unfruitful works of darkness, but rather reprove them.
Hebrews 11:23-27 By faith Moses, when he was born, was hid three months of his parents, because they saw he was a proper child; and they were not afraid of the king’s commandment. By faith Moses, when he was come to years, refused to be called the son of Pharaoh’s daughter; Choosing rather to suffer affliction with the people of God, than to enjoy the pleasures of sin for a season; Esteeming the reproach of Christ greater riches than the treasures in Egypt: for he had respect unto the recompence of the reward. By faith he forsook Egypt, not fearing the wrath of the king: for he endured, as seeing him who is invisible.