Ja'far ibn Muhammad reported that his father said:

"Allah’s Messenger (ﷺ) died on Monday, after which he remained that day and Tuesday night, and he was buried during the night.” According to Sufyan [ibn 'Uyaina], someone else said: “The sound of the iron shovels could be heard during the latter part of the night.”

حَدَّثَنَا مُحَمَّدُ بْنُ أَبِي عُمَرَ، قَالَ‏:‏ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ، عَنْ أَبِيهِ، قَالَ‏:‏ قُبِضَ رَسُولُ اللهِ صلى الله عليه وسلم يَوْمَ الاثْنَيْنِ فَمَكَثَ ذَلِكَ الْيَوْمَ وَلَيْلَةَ الثُّلاثَاءِ، وَدُفِنَ مِنَ اللَّيْلِ، وَقَالَ سُفْيَانُ‏:‏ وَقَالَ غَيْرُهُ‏:‏ يُسْمَعُ صَوْتُ الْمَسَاحِي مِنْ آخِرِ اللَّيْلِ‏.‏