Muwatta Malik #574
Burials
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَائِشَةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم كَانَتْ تَقُولُ كَسْرُ عَظْمِ الْمُسْلِمِ مَيْتًا كَكَسْرِهِ وَهُوَ حَىٌّ . تَعْنِي فِي الإِثْمِ .
Yahya related to me from Malik that he had heard that A'isha, the
wife of the Prophet, may Allah bless him and grant him peace, used to
say, "Breaking the bone of a muslim when he is dead is like breaking
it when he is alive." She meant if done in wrong action.
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About Muwatta Malik
This hadith is #574 from Muwatta Malik, in the Book of Burials.