مُوَطَّأُ مَالِكٍ
Muwatta Malik 551
Burials
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ أُمَّ سَلَمَةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم كَانَتْ تَقُولُ مَا صَدَّقْتُ بِمَوْتِ النَّبِيِّ صلى الله عليه وسلم حَتَّى سَمِعْتُ وَقْعَ الْكَرَازِينِ .
Yahya related to me from Malik that he had heard that Umm Salama, the wife of the Prophet, (ﷺ), used to say, "I did not believe that the Messenger of Allah, (ﷺ), had died until I heard the pickaxes fall."
Arabic/English book reference: Book 16, Hadith 29