(21) باب مَا جَاءَ فِي سَهْمِ الصَّفِيِّ
Anas bin Malik said "We came to Khaibar. We bestowed the conquest of fortress (on us), the beauty of Safiyyah daughter of Huyayy was mentioned to him (the Prophet). Her husband was killed (in the battle) and she was a bride. The Apostle of Allaah(ﷺ) chose her for himself. He came out with her till we reached Sadd Al Sahba' where she was purified. So he cohabited with her.
Reference: Sunan Abi Dawud 2995
In-book reference: Book 20, Hadith 68
English translation: Book 19, Hadith 2989