I saw As-Sa'ib bin Yazid when he was ninety-four years old, quite strong and of straight figure. He said, "I know that I enjoyed my hearing and seeing powers only because of the invocation of Allah's Apostle . My aunt took me to him and said, 'O Allah's Messenger (ﷺ)! My nephew is sick; will you invoke Allah for him?' So he invoked (Allah) for me."
Reference: Sahih al-Bukhari 3540 In-book : Book 61, Hadith 49 USC-MSA web (English) : Vol. 4, Book 56, Hadith 740 (deprecated)
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