Musnad Ahmad 33:83

Yahya ibn Sa'id narrated to us, from Zakariyya, 'Amir narrated to me, from Jabir ibn 'Abdullah, who said: I was traveling on a camel of mine and it became exhausted, so I intended to let it go. He said: Then the Messenger of Allah (peace and blessings of Allah be upon him) caught up with me. He struck it with his foot and prayed for it, and it traveled at a pace it had never traveled before. He said: "Sell it to me for an ounce [of gold]." I disliked selling it, but he said: "Sell it to me." So I sold it to him, and I stipulated the condition that I be carried on it to my family. When we arrived, I brought the camel to him. He said: "Did you think when I bargained with you that I would take your camel? Take your camel and its price; they are both yours."