First Aqaba In the summer of 621 As'ad brought eleven friends to the trade-fair, and they met Muhammad at al-Aqaba. There they gave him the Pledge of Women: although they pledged allegiance to Muhammad, there was no mention of war. When they returned to Medina, Muhammad sent
Musab ibn Umayr with them. Musab lodged in As'ad's house. As'ad built a mosque on the property of two wards of his clan, close to the location of the future mosque built by Muhammad. He gathered forty men together, and they met to hear Musab read the Quran to them, teach them about Islam and lead the prayers. As'ad took Musab out to the Abdul-Ashhal and Zafar clans teach more people about Islam. This annoyed his cousin, Saad ibn Muadh, who was chief of the Abdul-Ashhal clan. One day Saad challenged As'ad as a group of Muslims were sitting comfortably in a garden. Musab explained Islam to Saad, and he was converted. This resulted in the conversion of Saad's whole clan. As'ad and Musab continued calling people to Islam until nearly every family included some Muslims.
Second Aqaba In June 622 a large party of Medinans went to Mecca for the trade-fair. They included As'ad, Musab and 74 other Muslims. The Muslims left camp in the middle of the night to meet Muhammad secretly at al-Aqaba. Muhammad invited them to make a
second pledge of allegiance to him "as you would to your women and children." According to the Najjar clan, As'ad was the first to strike his hand in fealty; but the Abdul-Ashhal clan said that it was Abu'l-Haytham and the Jusham clan said it was al-Baraa ibn Maarur. As As'ad took Muhammad's hand, he said: "People, do you know on what basis you give allegiance to Muhammad? You give allegiance to him on the basis of fighting the Arabs and non-Arabs,
jinn and men." The Medinans replied, "We will fight those who fight and make peace with those who make peace." Muhammad said, "Give allegiance on the basis that you bear witness that there is no god but Allah and that I am Allah's Messenger; establish the prayer and pay
alms; hear and obey. Do not contend the business of his family and deny me what you deny yourselves and your people." They all agreed. Muhammad selected twelve men to be leaders of the Muslim community in Medina, "sureties for your people just as the disciples of
Jesus son of Mary were responsible to him, while I am responsible for my people." As'ad was among the twelve.
The Hijrah Musab returned to Mecca so that he would formally qualify as an
Immigrant. While he was away, As'ad led the prayers at the mosque five times a day. The Muslims from Mecca began to arrive in Medina, where they lodged as guests in the homes of the Medinan converts. It is variously claimed that
Talha ibn Ubaydallah and
Hamza ibn Abdul-Muttalib stayed at As'ad's house. ==Death==