Allah's Messenger (ﷺ) said, "If anyone of you leads the people in the prayer, he should shorten it for amongst them are the weak, the sick and the old; and if anyone among your prays alone then he may prolong (the prayer) as much as he wishes. "
Reference: Sahih al-Bukhari 703 In-book : Book 10, Hadith 98 USC-MSA web (English) : Vol. 1, Book 11, Hadith 671 (deprecated)
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