مُوَطَّأُ مَالِكٍ
Muwatta Malik 567
Burials
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, (ﷺ), 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.
Arabic/English book reference: Book 16, Hadith 45