I used to accompany Salama bin Al-Akwa` and he used to pray behind the pillar which was near the place where the Qur’ans were kept. I said, “O Abu Muslim! I see you always seeking to pray behind this pillar.” He replied, “I saw Allah’s Messenger (ﷺ) always seeking to pray near that pillar.”
Salama said, “I gave the Pledge of allegiance (Al-Ridwan) to Allah’s Messenger (ﷺ) and then I moved to the shade of a tree. When the number of people around the Prophet (ﷺ) diminished, he said, ‘O Ibn Al-Akwa` ! Will you not give to me the pledge of Allegiance?’ I replied, ‘O Allah’s Messenger (ﷺ)! I have already given to you the pledge of Allegiance.’ He said, ‘Do it again.’ So I gave the pledge of allegiance for the second time.” I asked ‘O Abu Muslim! For what did you give he pledge of Allegiance on that day?” He replied, “We gave the pledge of Allegiance for death.”