Sa'd, the freed slave of Sayyiduna Abu Bakr (may Allah be pleased with him), said: We were with the Messenger of Allah (peace and blessings be upon him) (I think he said: on a journey), and we stopped at a place to camp. He (peace and blessings be upon him) said to me: "O Sa'd, go to that goat and milk it." Yet I remembered that there had been no goat in that place. I went there, and there was a goat with udders full of milk. I milked it (I do not remember how many times), then I entrusted it to someone and became busy preparing to move on, and meanwhile the goat went away. The Messenger of Allah (peace and blessings be upon him) felt that I was late, and said: "O Sa'd!" I said: "O Messenger of Allah, preparing to move on kept us busy, and the goat went away." He (peace and blessings be upon him) said: "The goat was taken away by its Owner."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5475