Maliks Muwatta Book 50, Hadith Number 17.
Section : Visiting the Invalid and the Evil Omen.
Yahya related to me from Malik that he had heard from Jabir ibn Abdullah that the Messenger of Allah, may Allah bless him and grant him peace, said, “When a man visits an invalid, he plunges into mercy to the extent that when he sits with him, it settles in him,” or the like of that.