Musnad Ahmad 652:77

Ahmad ibn Abd al-Malik—meaning al-Harrani—narrated to us, he said: Sharik narrated to us, from Simak, from al-Nu’man ibn Bashir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "By Allah, Allah is more joyful at the repentance of His servant than a man who was on a journey in a desolate land, so he sought the shade of a tree and slept beneath it. He awoke and did not find his riding beast. He went to a high place and climbed it, and looked out, but he did not see anything. Then he went to another, and looked out, but he did not see anything. He said: 'I will return to the place I was in, and I will remain there until I die.'" He said: "So he went, and suddenly his riding beast was there, pulling its halter." He said: "So Allah, the Almighty and Majestic, is more joyful at the repentance of His servant than this man is at his riding beast."