 Following the pledge, Muhammad decided to send a Muslim "ambassador", Mus`ab ibn `Umair, to Medina in order to teach people about Islam and invite them to it.Converts to Islam came from nearly all Arab tribes present in Medina, such that by June of the subsequent year there were seventy-five Muslims coming to Mecca for pilgrimage and to meet Muhammad.Meeting him secretly by night, the group made what was known as the ""Second Pledge of al-`Aqaba"", or the ""Pledge of War"".