"Sa'd was wounded on the day of Al-Khandaq [1] when a man of Quraish shot him in the medial arm vein. The Messenger of Allah (ﷺ) pitched a tent (Khaimah) for him in the Masjid so that he could visit him close at hand." [1] Al-Khandaq means the trench. This indicates the battle of the trench which took place during the fifth year after Hijrah.
Reference: Sunan an-Nasa'i 710 In-book : Book 8, Hadith 23 English translation : Vol. 1, Book 8, Hadith 711
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