Exodus 12:2-
14 This month [
shall be] unto you the beginning of months: it [
shall be] the first month of the year to you. ... And this day shall be unto you for a 
memorial; and ye shall keep it 
a feast to the LORD throughout your generations; ye shall keep it a feast 
by an ordinance for ever.
Exodus 12:18 In the first [
month], on the fourteenth day of the month at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.
Exodus 13:3-
10 And Moses said unto the people, 
Remember this day, in which ye came out from Egypt, 
out of the house of 
bondage; for by strength of hand the LORD brought you out from this [
place]: 
there shall no leavened bread be eaten. ... Thou shalt therefore keep this ordinance in his season from year to year.
Exodus 23:15 Thou shalt keep 
the feast of unleavened bread: (thou shalt eat unleavened bread seven days, as I commanded thee, in the time appointed of the month Abib; for in it thou camest out from Egypt: 
and none shall appear before me empty:)
Numbers 9:2-
7 Let the children of Israel also 
keep the passover at 
his appointed season. ... And those men said unto him, We [
are] defiled by the dead body of a man: wherefore are we kept back, that 
we may not offer an offering of the LORD in his appointed season among the children of Israel?
Numbers 28:16 And in the fourteenth day of the first month [
is] the passover of the LORD.
Deuteronomy 16:1-
8 Observe 
the month of Abib, and keep 
the passover unto the LORD thy God: 
for in the month of Abib the LORD thy God brought thee forth out of Egypt by night. ... 
Six days thou shalt eat unleavened bread: and on the seventh day [
shall be] a 
solemn assembly to the LORD thy God: thou shalt do no work [
therein].
Joshua 5:10 And the children of Israel encamped in Gilgal, and 
kept the passover on the fourteenth day of the month at even in the plains of Jericho.
2 Chronicles 35:18-
19 And 
there was no passover like to that kept in Israel from the days of Samuel the prophet; 
neither did all the kings of Israel keep such a passover as Josiah kept, and the priests, and the Levites, and all Judah and Israel that were present, and the inhabitants of Jerusalem. ... In the eighteenth year of the reign of Josiah was this passover kept.
Matthew 26:17 Now 
the first [
day] of the [
feast of] unleavened bread the disciples came to Jesus, saying unto him, 
Where wilt thou that we prepare for thee to eat the passover?
Mark 14:12 And 
the first day of unleavened bread, when they 
killed the passover, his disciples said unto him, 
Where wilt thou that we go and prepare that thou mayest eat the passover?
Luke 22:7 Then came the day of unleavened bread, when the passover must be killed.
1 Corinthians 5:7-
8 Purge out therefore the old leaven, that 
ye may be a new lump, as ye are unleavened. For even 
Christ our passover is 
sacrificed for us: ... Therefore 
let us keep the 
feast, 
not with old leaven, 
neither with the leaven of malice and wickedness; 
but with the unleavened [
bread] of sincerity and truth.