Luke 22:7

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

Cross References (ranked by relevance)

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.

Luke 22:1

Now the feast of unleavened bread drew nigh, which is called the Passover.

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.

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: