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.

2 Timothy 2:17 And their word will eat as doth a canker: of whom is Hymenand Philetus;

Matthew 13:33 ¶Another parable spake he unto them; The kingdom of heaven is like unto leaven, which a woman took, and hid in three measures of meal, till the whole was leavened.