بُلُوغُ الْمَرَامِ
Bulugh al-Maram 259
The Book of Prayer
وَعَنْ عَائِشَةَ -رَضِيَ اَللَّهُ عَنْهَا- قَالَتْ : { أُصِيبَ سَعْدٌ يَوْمَ اَلْخَنْدَقِ , فَضَرَبَ عَلَيْهِ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -خَيْمَةً فِي اَلْمَسْجِدِ , لِيَعُودَهُ مِنْ قَرِيبٍ } مُتَّفَقٌ عَلَيْهِ . [1]
Narrated 'Aishah (RA): On the day of al-Khandaq (battle of the Trench), Sa'd was injured and Allah's Messenger (ﷺ) pitched a tent for him in the mosque to visit him from a close distance. [Agreed upon].
Sunnah.com reference: Book 2, Hadith 131