Luke 22:7 KJV

Then came the day of unleavened bread, when the passover must be killed.

The passoverChrist kept the ordinances of the law, particularly that of the passover, to teach us to observe his gospel institutions, and most of all that of the Lord's...

The Passover Made ReadyTuesday, the 13th · Evening, as Matthew, Mark, and Luke tell it

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 12:6 And ye shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening.
Matthew 26:17–19 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 14:12–16 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 22:1 Now the feast of unleavened bread drew nigh, which is called the Passover.
1 Corinthians 5:7 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:

From OpenBible.info, most relevant first.

Jesus, the Christ His last Passover meal and his establishment of the Lord’s Supper (in Jerusalem)
Passover Observed with unleavened bread (no yeast)

Then δὲ de δέ Conjunction
came Ἦλθεν Ēlthen ἔρχομαι Verb · aorist active indicative, third person singular
the day ἡ hē Article · nominative feminine singular ἡμέρα hēmera ἡμέρα Noun · nominative feminine singular
of unleavened bread τῶν tōn Article · genitive neuter plural ἀζύμων azymōn ἄζυμος Adjective · genitive neuter plural
when ἐν en ἐν Preposition ᾗ hē ὅς Pronoun · dative feminine singular
the passover τὸ to Article · accusative neuter singular πάσχα pascha πάσχα Noun · accusative neuter singular
must ἔδει edei Verb · imperfect active indicative, third person singular δεῖ deî
be killed θύεσθαι thyesthai θύω Verb · present passive infinitive

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