Musannaf Ibn Abi Shaybah

Hazrat Muhammad says regarding the spoils of war that one-fifth (khums) of the spoils is for Allah, and a share is for the Prophet of Allah, and in the spoils of war, there is "safiy" for the Prophet of Allah ﷺ. (Safiy is that special portion which the Prophet of Allah ﷺ would set aside for himself before the distribution of the spoils.) Hazrat Ibn Sirin (may Allah have mercy on him) says that the best captive was set aside for the Prophet of Allah from the spoils, then the khums was taken out, then from the people's share, whether present or absent, a share was taken out. Hazrat Ibn Sirin says that on the day of Khaybar, the Prophet of Allah ﷺ set aside Hazrat Safiyyah bint Huyayy as safiy. And Hazrat Sha'bi says that on the day of Khaybar, the Prophet ﷺ set aside Hazrat Safiyyah bint Huyayy and then married her.