Charles Ellicott Commentary Deuteronomy 3:18-19

"And I commanded you at that time, saying, Jehovah your God hath given you this land to possess it: ye shall pass over armed before your brethren the children of Israel, all the men of valor. But your wives, and your little ones, and your cattle, (I know that ye have much cattle,) shall abide in your cities which I have given you," — Deuteronomy 3:18-19 (ASV)

This is a summary of the agreement made and described in Numbers 32:20–32. (See also Note on Joshua 1:12.)