Hadith: The last glance I had of the Messenger of Allah (may Allah’s peace and blessings be upon him) was when he uncovered the curtain while the people were in rows behind Abu Bakr

عن أنس رضي الله عنه قال: «آخِرُ نَظْرة نَظَرْتُها إلى رسول الله صلى الله عليه وسلم كَشَف السِّتارة والناسُ صُفوف خَلْف أبي بكر رضي الله عنه ، فأراد أبو بكر أنْ يَرْتَدَّ، فأشار إليهم أَنِ امكثُوا وأَلْقى السِّجْفَ، وتُوفِّي مِن آخِرِ ذلك اليوم، وذلك يومَ الإثنين».
[صحيح] - [رواه النسائي, وأصله في مسلم]

Anas (may Allah be pleased with him) reported: The last glance I had of the Messenger of Allah (may Allah’s peace and blessings be upon him) was when he uncovered the curtain while 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 Monday.
[Authentic hadith] - [An-Nasaa’i - Narrated by Muslim]

Explanation

The last time Anas (may Allah be pleased with him) saw the Prophet (may Allah's peace and blessings be upon him) was when he uncovered the curtain separating his house from the mosque. The Prophet (may Allah's peace and blessings be upon him) saw the people praying in rows behind Abu Bakr (may Allah be pleased with him). Upon noticing this, Abu Bakr thought that the Prophet (may Allah's peace and blessings be upon him) wanted to come out to lead the people in prayer. Therefore, he was about to step back to join the rows and make room for the Prophet. However, the Prophet (may Allah's peace and blessings be upon him) gestured to the people, ordering them to stay as they were and to complete their prayer. Then he let the curtain fall and died at the end of that day, which was Monday.