When one of us had a complaint God’s messenger wiped him with his right hand and then said, “Remove the harm, Lord of men, and give healing. Thou art the Healer. There is no healing but Thine, a healing which leaves no illness behind.”
Ibn ‘Abbas said that the Prophet went in to visit a Bedouin Arab, and when he entered to visit a sick man he was accustomed to say, “No harm will come; it is a purification, if God will.” He repeated these words, and when the man replied, “Not at all; it is on the contrary a fever which is boiling in an old man and will cause him to visit the graves,” the Prophet said, “Very well, then.”
She said that when a person complained of some trouble, or if he had a sore or a wound, the Prophet would say while pointing with his finger, “In the name of God. It is the soil of our land with the spittle of one of us (the suggestion is that the Prophet took some earth on his finger and spat on it), that our sick one may be healed by our Lord’s permission.”
Narrated Abu Huraira reported God’s messenger as saying:
On the day of resurrection God most high will say, “Son of Adam, I was sick and you did not visit me.” He will reply, “My Lord, how could I visit Thee when Thou art the Lord of the universe?” He will say, “Did you not know that my servant so and so was ill and yet you did not visit him? Did you not know that if you had visited him you would have found me with him? Son of Adam, I asked you for food but you gave me none.” He will reply, “My Lord, how could I feed Thee when Thou art the Lord of the universe?” He will say, “Did you not know that my servant so and so asked you for food and yet you gave him none? Did you not know that if you had fed him you would have found that with me? Son of Adam, I asked you for drink but you gave me none.” He will reply “My Lord, how could I give Thee drink when Thou art the Lord of the universe?” He will say, “My servant so and so asked you for drink but you gave him none. Did you not know that if you had given him something to drink you would have found that with me?’’