1CO 5:6

6 It is not good that, [while you are letting that immoral man continue to be in your congregation], you are boasting [about being spiritually mature]. ◄You know that a small amount of yeast affects all the bread dough [MET] [into which it is put] {[a woman puts it]}./Do you not know that a small amount of yeast affects all the bread dough [MET] [into which it is put]?► [RHQ] [Similarly, one person who continues to sin will have a bad effect on all the congregation].