Sahih al-Bukhari Book 75, Hadith 16
The Prophet (ﷺ) went to visit a sick bedouin. Whenever the Prophet (ﷺ) went to a patient, he used to say to
him, "Don't worry, if Allah will, it will be expiation (for your sins):" The bedouin said, "You say
expiation? No, it is but a fever that is boiling or harassing an old man and will lead him to his grave
without his will." The Prophet (ﷺ) said, "Then, yes, it is so."
Usama bin Zaid said that while he. Sa`d and Ubai bin Ka`b were with the Prophet (ﷺ) a daughter of the Prophet sent a message to him, saying. 'My daughter is dying; please come to us." The Prophet (ﷺ) sent her his greetings and added "It is for Allah what He takes, and what He gives; and everything before His sight has a limited period. So she should hope for Allah's reward and remain patient." She again sent a message, beseeching him by Allah, to come. So the Prophet (ﷺ) got up. and so did we (and went there). The child was placed on his lap while his breath was irregular. Tears flowed from the eyes of the Prophet. Sa`d said to him, "What is this, O Allah's Messenger (ﷺ)?" He said. "This Is Mercy which Allah has embedded in the hearts of whomever He wished of His slaves. And Allah does not bestow His Mercy, except on the merciful among His slaves. (See Hadith No. 373 Vol. 2)
A Jewish boy used to serve the Prophet (ﷺ) and became ill. The Prophet (ﷺ) went to pay him a visit and said to him, "Embrace Islam," and he did embrace Islam. Al-Musaiyab said: When Abu Talib was on his deathbed, the Prophet (ﷺ) visited him.