1 Corinthians 5:6; 1 Corinthians 15:33; Hebrews 12:15

fYour boasting is not good. Do you not know that ga little leaven leavens the whole lump?

33 yDo not be deceived: zBad company ruins good morals.1

15 See to it that no one vfails to obtain the grace of God; that no wroot of bitterness springs up and causes trouble, and by it many become defiled;