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.
For seven days you must eat unleavened bread. From the very first day you will have your houses clear of all leaven. For whoever eats leavened bread from the first day to the seventh will be cut off from Israel.
He spoke to them another parable. “The kingdom of heaven is like yeast that a woman took and mixed with three measures of wheat flour until the whole batch was leavened.” The Use of Parables.
On the first day of the Feast of Unleavened Bread, when they sacrificed the Passover lamb, his disciples said to him, “Where do you want us to go and prepare for you to eat the Passover?”
and they cried out in a loud voice: “Worthy is the Lamb that was slain to receive power and riches, wisdom and strength, honor and glory and blessing.”