Musnad Abu Ya'la al-Mawsili 117:182

Ishaq ibn Abi Isra'il narrated to us, Abd al-Razzaq narrated to us, Ma'mar informed us, from Thabit, from Anas, that a man from the people of the desert whose name was Zahir used to bring gifts to the Prophet, may God bless him and grant him peace, from the desert, and the Messenger of God, may God bless him and grant him peace, would provide him with supplies when he wanted to leave. The Prophet, may God bless him and grant him peace, said, "Zahir is our desert, and we are his city-dwellers." The Prophet, may God bless him and grant him peace, loved him, and he was an unattractive man. The Prophet, may God bless him and grant him peace, came to him while he was selling his goods and embraced him from behind, while the man could not see him. He said, "Release me! Who is this?" Then he recognized the Prophet, may God bless him and grant him peace, so he began not to hold back, pressing his back against the chest of the Prophet once he recognized him. The Messenger of God, may God bless him and grant him peace, began saying, "Who will buy this slave?" The man said, "O Messenger of God, in that case, you will find me unsellable." The Prophet, may God bless him and grant him peace, said, "But in the sight of God, you are not unsellable," or he said, "In the sight of God, you are valuable."