John Gill Commentary Deuteronomy 3:19

"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 3:19 (ASV)

But your wives, and your little ones, and your cattle
These were to be left behind: for

I know that you have much cattle ;
which made the countries of Gilead and Bashan, so famous for pasturage, agreeable to them; see (Numbers 32:1) these, under the care of servants, and also their wives and children,

shall abide in your cities which I have given you ;
and which they rebuilt and repaired, (Numbers 32:34–42) .