Abu Jandal was an early convert to Islam, following the lead of his brother Abdullah ibn Suhayl. Due to the position of their father Suhayl ibn Amr in the leadership of Quraysh, Abu Jandal and Abdullah were persecuted and hid their conversion. Abdullah converted to Islam and cleverly rode with the vanguard of Quraysh to Badr where he switched sides and joined Muhammad and battled against the pagans of Quraysh and his father the next day. When Suhayl learned that his second son was a Muslim, he had him beaten and locked at home. Abu Jandal remained in this state under close watch and harsh punishment for several years until the time of the Treaty of Hudabiyyah.