Sunan an Nasai 1831
The Book of Funerals
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنِ الزُّهْرِيِّ، عَنْ أَنَسٍ، قَالَ آخِرُ نَظْرَةٍ نَظَرْتُهَا إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم كَشَفَ السِّتَارَةَ وَالنَّاسُ صُفُوفٌ خَلْفَ أَبِي بَكْرٍ رضى الله عنه فَأَرَادَ أَبُو بَكْرٍ أَنْ يَرْتَدَّ فَأَشَارَ إِلَيْهِمْ أَنِ امْكُثُوا وَأَلْقَى السِّجْفَ وَتُوُفِّيَ مِنْ آخِرِ ذَلِكَ الْيَوْمِ وَذَلِكَ يَوْمُ الاِثْنَيْنِ .
It was narrated that Anas said:"The last time I saw the Messenger of Allah, he drew back the curtain when the people were in rows behind Abu Bakr, may Allah be pleased with him. Abu Bakr wanted to step back, but he gestured to them to stay as they were, and let the curtain drop. He died at the end of that day, and that was a Monday
Grading: Abu Ghuddah: Sahih · Al-Albani: Sahih · Zubair Ali Zai: Sahih - Agreed Upon
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.