Sahih Bukhari Volume 8, Book 73, Hadith Number 112.

Narated By Jarir : The Prophet did not screen himself from me (had never prevented me from entering upon him) since I embraced Islam, and whenever he saw me, he would receive me with a smile. Once I told him that I could not sit firm on horses. He stroked me on the chest with his hand, and said, “O Allah! Make him firm and make him a guiding and a rightly guided man.