I (Salama) gave the pledge of allegiance to Allah’s Apostle and then I moved to the shade of a tree. When the number of people around the Prophet diminished, he said, “O Ibn Al-Akwa! Will you not give to me the pledge of allegiance?”
I replied, “O Allah’s apostle! 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 the pledge of allegiance on that day?”
He replied, “WE GAVE THE PLEDGE OF ALLEGIANCE FOR DEATH”
The Medinans retired to the caravan for the night.
I304 The second oath of Aqaba had conditions of war that were not in the first oath. Now the Muslims of Medina were bound to war against all for Allah and Mohammed. For faithful service they would go to Paradise for complete obedience.
Quoted from The Islamic Trilogy Volume 1 Mohammed and the Unbelievers, A Political Life, published by the Center for the study of Political Islam.