The Book on Jana''iz (Funerals)
10/47. Chapter:
What Has Been Related About (Performing) The (Funeral) Salat At The Grave
Jami at-Tirmidhi
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ سَعِيدِ بْنِ أَبِي عَرُوبَةَ، عَنْ قَتَادَةَ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّ أُمَّ سَعْدٍ، مَاتَتْ وَالنَّبِيُّ صلى الله عليه وسلم غَائِبٌ فَلَمَّا قَدِمَ صَلَّى عَلَيْهَا وَقَدْ مَضَى لِذَلِكَ شَهْرٌ .
Sa'eedbin Musayyab narrated: "Umm Sa'D Died While The Prophet Was Absent. So When He Arrived He Performed Salat Over Her, And A Month Had Already Passed."
Reference : Jami` at-Tirmidhi 1038In-book reference : Book 10, Hadith 74English translation : Vol. 2, Book 5, Hadith 1038