Galatians 5:9
A little leaven doth leaven the whole lump of dough.
1 Corinthians 15:33
Be not deceived: malicious speakings corrupt good manners.
Matthew 16:6-12
Then Jesus said unto them, "Take heed, and beware of the leaven of the Pharisees, and of the Sadducees."
Matthew 23:33
ye serpents and generation of vipers, how should ye escape the damnation of hell?
Mark 8:15
And he charged them, saying, "Take heed, and beware of the leaven of the Pharisees, and of the leaven of Herod."
Luke 12:1
As there gathered together an innumerable multitude of people - insomuch that they trod one another - he began to say unto his disciples, "First of all, beware of the leaven of the Pharisees, which is hypocrisy.
Luke 13:21
It is like leaven, which a woman took, and hid in three bushels of flour, till all was through-leavened."
1 Corinthians 5:6-7
Your rejoicing is not good. Know ye not that a little leaven soureth the whole lump of dough?
2 Timothy 2:17
and their words shall fret even as doth a canker: of whose number is Hymenaeus and Philetus,