Exodus 12:1-51 recounts the original Passover institution; Ezekiel 45:21 commands its observance, directly referencing this foundational event.

Leviticus 23:5-8 gives the law for Passover and Unleavened Bread; Ezekiel 45:21 reiterates the same feast regulations.

Numbers 28:16-25 lists the Passover and Unleavened Bread offerings; Ezekiel 45:21 prescribes the feast itself.

Deuteronomy 16:1-8 prescribes the Passover on the 14th of the first month, the same feast Ezekiel commands here — a direct echo of the law.

1 Corinthians 5:7 identifies Christ as our Passover lamb, showing the feast's typological fulfillment — the lamb sacrificed for us.

Exodus 12:6 sets the Passover date — the 14th day — exactly as Ezekiel restates it here, grounding the command in the original institution.

2 Chronicles 35:1 records Josiah's Passover on the 14th day — a historical example of the observance Ezekiel commands.

Numbers 9:2-14 provides additional Passover instructions for special cases; Ezekiel 45:21 commands the basic observance.

Numbers 28:19 details offerings for the first day of Unleavened Bread, supplementing Ezekiel's feast command with sacrificial specifics.

1 Corinthians 5:8 applies the unleavened bread metaphor to Christian conduct — a moral application of the feast's symbolism.