Deuteronomy 20:14-16

Young's Literal Translation

¹⁴ Only, the women, and the infants, and the cattle, and all that is in the city, all its spoil, thou dost seize for thyself, and thou hast eaten the spoil of thine enemies which Jehovah thy God hath given to thee.

¹⁵ So thou dost do to all the cities which are very far off from thee, which are not of the cities of these nations.

¹⁶ `Only, of the cities of these peoples which Jehovah thy God is giving to thee [for] an inheritance, thou dost not keep alive any breathing;