There was no needy person among them, for those who owned property or houses would sell them, bring the proceeds of the sale, and put them at the feet of the apostles, and they were distributed to each according to need. The Acts of the Apostles, 4:34-35
Brothers and sisters: Do you not know that a little yeast leavens all the dough? Clear out the old yeast, so that you may become a fresh batch of dough, inasmuch as you are unleavened. For our paschal lamb, Christ, has been sacrificed. Therefore, let us celebrate the feast, not with the old yeast, the yeast of malice and wickedness, but with the unleavened bread of sincerity and truth. St. Paul’s First Letter to the Corinthians, 5:6b-8