Sahih al-Bukhari 2235

It is related that Anas ibn Malik said, "The Prophet, may Allah bless him and grant him peace, came to Khaybar and when Allah let him conquer the fortress, the beauty of Safiyya bint Huyayy ibn Akhtab was mentioned to him. Her husband had been killed and she was a bride. The Messenger of Allah, may Allah bless him and grant him peace, chose her for himself and went with her until we reached Sadd ar-Rawha' where she became lawful and he went to her in marriage. Then some hays was put on a small leather mat. Then the Messenger of Allah, may Allah bless him and grant him peace, said, 'Announce it to those around you.' That was the marriage-feast of the Messenger of Allah, may Allah bless him and grant him peace, with Safiyya. Then we left for Madina." He said, "I saw the Messenger of Allah, may Allah bless him and grant him peace, enfolding her in his cloak. Then he sat beside his camel and put his knee up and Safiyya put her foot on his knee to mount."