Deu16:4 For seven days let no leaven be used through all your land; and nothing of the flesh which is put to death in the evening of the first day is to be kept through the night till morning.
Mat13:33 Another story he gave to them: The kingdom of heaven is like leaven, which a woman took, and put in three measures of meal, till it was all leavened.
Luk13:21 It is like leaven, which a woman put into three measures of meal, and it was all leavened.
1Co5:6 This pride of yours is not good. Do you not see that a little leaven makes a change in all the mass?
Gal5:9 A little leaven makes a change in all the mass.