This is among the matters established by mass-transmitted authentic hadiths. He continued to lead them in prayer until dawn on Monday. He led them in the Fajr prayer, and the Prophet—may Allah bless him and grant him peace—drew back the curtain and saw them praying behind Abū Bakr. When they saw him, they nearly became distracted in their prayer. He then lowered the curtain. That was their last sight of him, and he died on Monday when the morning was well advanced, shortly before midday.
It has also been said that he led them for longer than that, from (1) the preceding Friday (2), which would mean that he led them throughout the Prophet’s illness. However, (3) “the Prophet—may Allah bless him and grant him peace—came out for one prayer when he felt somewhat better. He stepped forward and placed Abū Bakr to his right. Abū Bakr followed the Prophet—may Allah bless him and grant him peace—(4), while the people followed Abū Bakr.” At the Fajr prayer on Monday, he drew back the curtain while they were praying behind Abū Bakr. His face—may Allah bless him and grant him peace—was like a page of the Quran, and he was delighted to see the people gathered in prayer behind Abū Bakr. They did not see him again after that.
It has also been said that the last prayer he performed was behind Abū Bakr. It is further said that he performed another prayer behind him as well.
How, then, could it be imagined that he ordered Abū Bakr to depart on the military expedition while also ordering him to lead the people in prayer?!