Numbers 32:24-27
24 Build cities for your women and children, and pens for your flocks, but do what you have promised.”
25 The Gadites and Reubenites said to Moses, “We your servants will do as our lord commands.
26 Our children and wives, our flocks and herds will remain here in the cities of Gilead.
27 But your servants, every man armed for battle, will cross over to fight before the Lord, just as our lord says.”