al-Hasan bin Arfh bin Yazid الحسن بن عرفة بن يزيد · The Book of the Sunnah

"The Messenger of Allah never refused to see me from the time I became Muslim, and whenever he saw me he would smile at me. I complained to him that I could not sit firmly on a horse, so he struck me on the chest with his hand and said: 'O Allah, make him firm and cause him to guide others and be rightly-guided.'"