Anas ibn Malik said:

"The last occasion when I caught sight of Allah’s Messenger (ﷺ) was the unveiling of the curtain on a Monday. I looked at his face as if it were a parchment of the Qur’an, as the people were performing the ritual prayer behind Abu Bakr. The people were about to get restless, so he gestured to them to keep calm, as Abu Bakr led them in prayer, and he cast the curtain aside. Allah’s Messenger (ﷺ) died at the end of that day.”

حَدَّثَنَا أَبُو عَمَّارٍ الْحُسَيْنُ بْنُ حُرَيْثٍ، وَقُتَيْبَةُ بْنُ سَعِيدٍ، وَغَيْرُ وَاحِدٍ، قَالُوا‏:‏ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنِ الزُّهْرِيِّ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ‏:‏ آخِرُ نَظْرَةٍ نَظَرْتُهَا إِلَى رَسُولِ اللهِ صلى الله عليه وسلم، كَشْفُ السِّتَارَةِ يَوْمَ الاثْنَيْنِ، فَنَظَرْتُ إِلَى وَجْهِهِ كَأَنَّهُ وَرَقَةُ مُصْحَفٍ، وَالنَّاسُ خَلْفَ أَبِي بَكْرٍ، فَكَادَ النَّاسُ أَنْ يَضْطَربُوا، فَأَشَارَ إِلَى النَّاسِ أَنِ اثْبُتُوا، وَأَبُو بَكْرٍ يَؤُمُّهُمْ وَأَلْقَى السِّجْفَ، وَتُوُفِّيَ رَسُولُ اللهِ صلى الله عليه وسلم مِنْ آخِرِ ذَلِكَ الْيَوْمِ‏.‏