Thuwayr reported his father as saying that Sayyidina Ali held him by his hand aid, ‘Come, let us pay a sick visit to Husayn .“ There they found Sayyidina Abu Musa (RA) with him. Sayyidina Ali asked him, “Have you come to pay a sick visit, 0 Abu Musa, or just a regular visit?” He said, “I have come to visit the sick.” So, Ali said, “I heard Allah’s Messenger (SAW)say : If a Muslim pays visit to a sick Muslim in the morning, seventy thousand angels pray for him till evening, and if he pays him the sick visit at night then seventy thousand angels pray for him till morning, and there is (also) a garden for him in Paradise.”
[Abu Dawud 3098, Ibn e Majah 1442]