Musnad Ahmad 457:22

Ibn Numayr, Ya‘la, and Muhammad—meaning the sons of ‘Ubayd—narrated to us, they said: Al-A‘mash informed us, from Abu ‘Amr al-Shaybani, from Abu Mas‘ud al-Ansari, who said: A man came to the Prophet, peace and blessings of Allah be upon him, and said: "My mount has become exhausted, so provide me with a mount." He said: "I do not have anything to provide you with a mount upon, but go to such-and-such person." So he went to him, and he provided him with a mount. Then he came to the Messenger of Allah, peace and blessings of Allah be upon him, and informed him. The Messenger of Allah, peace and blessings of Allah be upon him, said: "Whoever guides to a good deed, he shall have the like of the reward of the one who performs it." Muhammad said: "For indeed, my mount has become exhausted."