It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) on the day of Khaybar forbade (intercourse with) pregnant (captive) women, and said: "Would you water another's crop with your water?" And he forbade selling the spoils of war before they were distributed, eating the meat of domestic donkeys, and every predatory animal with fangs.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11100