"When one of you visits the ill, then reassure him regarding his lifespan. Indeed that will not repel anything, but it will comfort his soul."
Jami` at-Tirmidhi Book 28, Hadith 52
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Jami` at-Tirmidhi Book 28, Hadith 51 Next Hadith → "Cheer up, for indeed Allah said: 'It is My Fire which I impose upon My sinning slave as his portion of the Fire." (Hasan)

Al-Hasan said: "They would hope that the fever that occurred at night would atone for any deficiency caused by sins."

Jami` at-Tirmidhi Book 28, Hadith 53