The First Pledge of Aqabah
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The following year, twelve Ansar attended the festival in Makkah. They met the Messenger of Allah and gave him their pledge, the First Pledge of Aqabah, that they would believe in one God, abstain from theft, fornication and killing children, and obey him in what was right and proper.
When they left, the Messenger of Allah sent Mus'ab ibn Umayr with them. He commanded him to read the Qur'an to them, to preach Islam and to instruct them in the religion. He also led them in prayers. He was called 'The Reader' in Madinah where he stayed with As'ad ibn Zurarah.