The Prophet SallAllahu Alaihi Wasallam's Pledge to Islam

Six men embraced Islam and then 12 of them took a pledge And they went back to Medina with Musab ibn al-Mul that was the first bayah to the Akaba. The Prophet SallAllahu Alaihi Wasallam places him as one of the 12 nakibs One of the 12 chiefs of that day when he makes hijra to Medina. He gets to take in to his home non-other than the adopted son of the Prophet  He'bul Rasulillah.