Musnad Ahmad 980:1

Abu Mu'awiyah narrated to us, Al-A'mash narrated to 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: "O Messenger of Allah, my mount has become exhausted, so provide me with a mount." He said: He replied, "I do not have one." A man then said: "O Messenger of Allah, shall I not direct him to someone who will provide him with a mount?" The Messenger of Allah, peace and blessings of Allah be upon him, said: "Whoever directs to a good deed, he shall have the like of the reward of the one who performs it."