Psalm 137:8-9: "Daughter Babylon, doomed to destruction, happy is the one who repays you according to what you have done to us. Happy is the one who seizes your infants and dashes them against the rocks."
1 Samuel 15:3 - "Now go, attack the Amalekites and totally destroy all that belongs to them. Do not spare them; put to death men and women, children and infants, cattle and sheep, camels and donkeys.” (Netanyahu actually referenced this one in a speech last year).
Oh, and if you want to know how to treat captives of war Deuteronomy 21:10-14 has you covered: "When you go to war against your enemies and the Lord your God delivers them into your hands and you take captives, if you notice among the captives a beautiful woman and are attracted to her, you may take her as your wife. Bring her into your home and have her shave her head, trim her nails and put aside the clothes she was wearing when captured. After she has lived in your house and mourned her father and mother for a full month, then you may go to her and be her husband and she shall be your wife. If you are not pleased with her, let her go wherever she wishes. You must not sell her or treat her as a slave, since you have dishonored her." (You can claim a woman whose family you just killed, and force her to have sex with you, but afterwards if you decide you don't want her you have to simply toss her out, not actually sell her into slavery because you've "dishonored her" with sex.)