Virtues and Merits of the Prophet (pbuh) and his Companions

Bukhari :: Book 4 :: Volume 56 :: Hadith 740

Narrated Al-Ju'aid bin 'Abdur Rahman:

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 Apostle! My nephew is sick; will you invoke Allah for him?' So he invoked (Allah) for me."

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