And Moses said unto them, Have ye saved all the women alive? ... Now therefore kill every male among the little ones, and kill every woman that hath known man by lying with him. But all the women children, that have not known a man by lying with him, keep alive for yourselves. 31:15
Trivia: After God killed Korah, his companions, their families, and 250 incense burners, the people complained saying, "ye have killed the people of the Lord." So God sent a plague on the people. How many people died in the plague?