(77) باب الْخَيْمَةِ فِي الْمَسْجِدِ لِلْمَرْضَى وَغَيْرِهِمْ
Narrated `Aisha:
On the day of Al-Khandaq (battle of the Trench' the medial arm vein of Sa`d bin Mu`ad [??] was injured and the Prophet (ﷺ) pitched a tent in the mosque to look after him. There was another tent for Banu Ghaffar in the mosque and the blood started flowing from Sa`d's tent to the tent of Bani Ghaffar. They shouted, "O occupants of the tent! What is coming from you to us?" They found that Sa`d' wound was bleeding profusely and Sa`d died in his tent.
Reference: Sahih al-Bukhari 463
In-book reference: Book 8, Hadith 111
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 8, Hadith 452