Numbers 31:18

But all the young of womankind that hay, not cohabited with man, preserve alive for yourselves.

Deuteronomy 21:10-14

When thou shalt go forth to war against thine enemies, - and Yahweh thy God shall deliver them into thy hand and thou shalt take them captive;

Leviticus 25:44

And as for thy bondman and thy bond-maid which thou shalt have, of the nations that are round about you - from them, may ye buy bondman and bond-maid.

Deuteronomy 20:14

but the women and the little ones and the cattle and all that shall be in the city - all the spoil thereof, shalt thou take as thy prey, - so shalt thou eat the spoil of thine enemies, whom Yahweh thy God hath delivered unto thee.

2 Chronicles 28:8-10

And the sons of Israel, carried away captive, from among their brethren two hundred thousand, wives, sons and daughters, moreover also, of much spoil, did they plunder them, - and brought the spoil to Samaria.

Isaiah 14:2

And peoples shall take them, and bring them into their own place, And the house of Israel shall possess themselves of them upon the soil of Yahweh for servants and for handmaids, - Thus shall they be taking captive their captors, And shall tread down their oppressors.

Treasury of Scripture Knowledge

Summary

But all the women children, that have not known a man by lying with him, keep alive for yourselves.

Bible References

Keep alive for yourselves

Deuteronomy 20:14
but the women and the little ones and the cattle and all that shall be in the city - all the spoil thereof, shalt thou take as thy prey, - so shalt thou eat the spoil of thine enemies, whom Yahweh thy God hath delivered unto thee.
Deuteronomy 21:10
When thou shalt go forth to war against thine enemies, - and Yahweh thy God shall deliver them into thy hand and thou shalt take them captive;
2 Chronicles 28:8
And the sons of Israel, carried away captive, from among their brethren two hundred thousand, wives, sons and daughters, moreover also, of much spoil, did they plunder them, - and brought the spoil to Samaria.
Isaiah 14:2
And peoples shall take them, and bring them into their own place, And the house of Israel shall possess themselves of them upon the soil of Yahweh for servants and for handmaids, - Thus shall they be taking captive their captors, And shall tread down their oppressors.