Joshua 1:13 has Joshua previously reminding these tribes of Moses' command—now he summons them after the conquest.

Numbers 32:18-33 records the original pledge by Reuben, Gad, and half-Manasseh to fight before returning — Joshua 22:1 now dismisses them as that vow is completed.

Deuteronomy 3:18 records Moses' original command for these tribes to fight alongside Israel—the backstory for Joshua's summons.

Deuteronomy 29:7 recalls the defeat of Sihon and Og, which led to the Transjordan inheritance that Joshua 22:1 now sends them back to.