(38) باب فَضْلِ مَنْ جَهَّزَ غَازِيًا أَوْ خَلَفَهُ بِخَيْرٍ
Narrated Anas:
The Prophet (ﷺ) used not to enter any house in Medina except the house of Um Sulaim besides those of his wives when he was asked why, he said, "I take pity on her as her brother was killed in my company. "
Reference: Sahih al-Bukhari 2844
In-book reference: Book 56, Hadith 60
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 52, Hadith 97