Exodus 12:14 institutes the Passover as a perpetual ordinance — the same feast that 13:10 commands to keep annually.

Exodus 12:24 repeats the command to observe this ordinance forever, reinforcing the annual keeping commanded in 13:10.

Exodus 23:15 commands the Feast of Unleavened Bread — the specific annual ordinance 13:10 says to keep in its season.

Leviticus 23:6 gives the date (15th of month) for the Feast of Unleavened Bread, defining the 'season' commanded in 13:10.

Deuteronomy 16:3 describes unleavened bread as bread of affliction to remember the hasty Exodus — reinforcing the memorial purpose of 13:10.

Deuteronomy 16:4 adds further regulations (no leaven, leftover meat) for the same Feast of Unleavened Bread commanded in 13:10.