Joshua 1:15
Until the Lord have given your brethren rest, as he hath given you, and they also have possessed the land which the Lord your God giveth them: then ye shall return unto the land of your possession, and enjoy it, which Moses the Lord’s servant gave you on this side Jordan toward the sunrising.
Cross-reference
In Joshua 22:4-9, Joshua sends the eastern tribes back to their inheritance, fulfilling the command here for them to return after helping conquer the land.
Joshua 21:44 declares that the Lord gave Israel rest from enemies, fulfilling the promise that allowed the eastern tribes to return home as instructed in 1:15.
Joshua 12:1 lists the kings east of Jordan defeated under Moses — the same land the eastern tribes received, mentioned in 1:15.
Numbers 32:17-22 is the original promise to fight until brothers possess their land, which Joshua 1:15 reiterates as a condition.
Numbers 32:19 records the eastern tribes' request for land east of Jordan, establishing the context for their conditional help in Joshua 1:15.
Numbers 32:22 is the original condition Moses gave the eastern tribes — the same obligation Joshua repeats in 1:15.
Hebrews 4:8 argues that Joshua did not give ultimate rest, contrasting the temporary rest promised in Joshua 1:15 with the eternal rest in Christ.