"The Iqamah for Zuhr prayer would be said, and a person could go to the Al-Baqi', relieve himself, perform wudhu, and come (to the masjid), and the Messenger of Allah (ﷺ) would still be in the first rak'ah, making it lengthy.
Reference: Sunan an-Nasa'i 973 In-book : Book 11, Hadith 98 English translation : Vol. 2, Book 11, Hadith 974
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