1 Corinthians 5:6-8 Your glorying is not good. Do you not know that a little leaven leavens the whole lump? Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us. Therefore let us keep the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.
Matthew 16:6-12 Then Jesus said to them, "Take heed and beware of the leaven of the Pharisees and the Sadducees." And they reasoned among themselves, saying, "It is because we have taken no bread." But Jesus, being aware of it, said to them, "O you of little faith, why do you reason among yourselves because you have brought no bread? Do you not yet understand, or remember the five loaves of the five thousand and how many baskets you took up? Nor the seven loaves of the four thousand and how many large baskets you took up? How is it you do not understand that I did not speak to you concerning bread?—but to beware of the leaven of the Pharisees and Sadducees." Then they understood that He did not tell them to beware of the leaven of bread, but of the doctrine of the Pharisees and Sadducees.
Exodus 12:15 Seven days you shall eat unleavened bread. On the first day you shall remove leaven from your houses. For whoever eats leavened bread from the first day until the seventh day, that person shall be cut off from Israel.
Exodus 13:3 And Moses said to the people: “Remember this day in which you went out of Egypt, out of the house of bondage; for by strength of hand the LORD brought you out of this place. No leavened bread shall be eaten.
Exodus 13:6-10 Seven days you shall eat unleavened bread, and on the seventh day there shall be a feast to the LORD. Unleavened bread shall be eaten seven days. And no leavened bread shall be seen among you, nor shall leaven be seen among you in all your quarters. And you shall tell your son in that day, saying, ‘This is done because of what the LORD did for me when I came up from Egypt.’ It shall be as a sign to you on your hand and as a memorial between your eyes, that the LORD’s law may be in your mouth; for with a strong hand the LORD has brought you out of Egypt. You shall therefore keep this ordinance in its season from year to year.
Leviticus 2:11 "No grain offering which you bring to the LORD shall be made with leaven, for you shall burn no leaven nor any honey in any offering to the LORD made by fire.
Luke 12:1 In the meantime, when an innumerable multitude of people had gathered together, so that they trampled one another, He began to say to His disciples first of all, "Beware of the leaven of the Pharisees, which is hypocrisy.
Leviticus 23:6-8 And on the fifteenth day of the same month is the Feast of Unleavened Bread to the LORD; seven days you must eat unleavened bread. On the first day you shall have a holy convocation; you shall do no customary work on it. But you shall offer an offering made by fire to the LORD for seven days. The seventh day shall be a holy convocation; you shall do no customary work on it.'"
Deuteronomy 16:3-4 You shall eat no leavened bread with it; seven days you shall eat unleavened bread with it, that is, the bread of affliction (for you came out of the land of Egypt in haste), that you may remember the day in which you came out of the land of Egypt all the days of your life. And no leaven shall be seen among you in all your territory for seven days, nor shall any of the meat which you sacrifice the first day at twilight remain overnight until morning.
Mark 8:15 Then He charged them, saying, 'Take heed, beware of the leaven of the Pharisees and the leaven of Herod.'
Exodus 12:17 So you shall observe the Feast of Unleavened Bread, for on this same day I will have brought your armies out of the land of Egypt. Therefore you shall observe this day throughout your generations as an everlasting ordinance.
Numbers 28:17 And on the fifteenth day of this month is the feast; unleavened bread shall be eaten for seven days.
Matthew 13:33 Another parable He spoke to them: "The kingdom of heaven is like leaven, which a woman took and hid in three measures of meal till it was all leavened."
Exodus 12:19-20 For seven days no leaven shall be found in your houses, since whoever eats what is leavened, that same person shall be cut off from the congregation of Israel, whether he is a stranger or a native of the land. You shall eat nothing leavened; in all your dwellings you shall eat unleavened bread."
Deuteronomy 16:8 Six days you shall eat unleavened bread, and on the seventh day there shall be a sacred assembly to the LORD your God. You shall do no work on it.