Exodus 12:18-20 commands eating unleavened bread from Passover onward — here they observe it after entering the land.

Exodus 13:6 commands seven days of unleavened bread — here they begin that practice on the day after Passover.

Exodus 13:7 commands no leaven seen in your territory — here they eat unleavened bread, implying obedience.

Leviticus 23:6 designates the 15th day as start of Feast of Unleavened Bread — exactly when they ate unleavened bread here.

Exodus 23:15 commands the Feast of Unleavened Bread for seven days — here they observe it immediately after Passover.

Numbers 15:19 commands a contribution when eating bread of the land — a law directly applicable to this first harvest in Canaan.

Psalm 105:44 recounts God giving the land and its produce — a direct parallel to Israel eating the firstfruits here.

Leviticus 23:14 prohibits eating new grain until after the offering — here they eat roasted grain from the land, possibly after fulfilling that.