He stood up to address us and said, "I will tell you nothing except what I heard the Messenger of Allah ﷺ say on the day of Hunayn. He said, 'It is not lawful for a man who believes in Allah and the Last Day to water another man's crop with his own water,' meaning intercourse with pregnant captive women, 'and it is not lawful for a man who believes in Allah and the Last Day to have intercourse with a captive woman until he has ascertained that she is not pregnant, and it is not lawful for a man who believes in Allah and the Last Day to sell any spoils of war until they have been distributed.'"
حدثنا النفيلي حدثنا محمد بن سلمة عن محمد بن إسحق حدثني يزيد بن أبي حبيب عن أبي مرزوق عن حنش الصنعاني
قام فينا خطيبا قال أما إني لا أقول لكم إلا ما سمعت رسول الله ﷺ يقول يوم حنين قال لا يحل لامرئ يؤمن بالله واليوم الآخر أن يسقي ماءه زرع غيره يعني إتيان الحبالى ولا يحل لامرئ يؤمن بالله واليوم الآخر أن يقع على امرأة من السبي حتى يستبرئها ولا يحل لامرئ يؤمن بالله واليوم الآخر أن يبيع مغنما حتى يقسم
Its chain of transmission is hasan. Tirmidhi narrated it, no. 1131, through another route from Ruwayfi, and he said it is hasan. Its basic form is found in Ibn Hibban, no. 1675, and the hadith has corroborating narrations in Tirmidhi, no. 1564, and elsewhere.