Musnad Ahmad 32:606

Ishaq ibn Sulayman narrated to us, he said: I heard Malik ibn Anas, from Ishaq ibn Abdullah ibn Abi Talha, from Anas ibn Malik, who said: "I was walking with the Messenger of Allah, peace and blessings of Allah be upon him, and he was wearing a Najrani cloak with a thick border. A Bedouin caught up with him and gave him a violent tug, until I saw the side of the neck of the Messenger of Allah, peace and blessings of Allah be upon him, marked by the border of the cloak due to the intensity of his tug. Then he said: 'O Muhammad, give me from the wealth of Allah that you have.' He turned to him, laughed, and then ordered a gift to be given to him."