Muwatta Malik, Book 49, Hadith 25 (USC-MSA)

Yahya related to me from Malik from Zayd ibn Aslam from Amr ibn Sad ibn Muadh from his grandmother that the Messenger of Allah, may Allah bless him and grant him peace, said, "O trusting women, none of you must consider even a roasted sheep's trotter too small to give to her neighbour."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عَمْرِو بْنِ سَعْدِ بْنِ مُعَاذٍ، عَنْ جَدَّتِهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ يَا نِسَاءَ الْمُؤْمِنَاتِ لاَ تَحْقِرَنَّ إِحْدَاكُنَّ لِجَارَتِهَا وَلَوْ كُرَاعَ شَاةٍ مُحْرَقًا ‏" ‏ ‏.‏

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also referenced under: Book 49, Hadith 1698 (In-Book)