Make this text more coherent
Mus ` ab ibn ` Umair was the first Muslim envoy in September 621. Mus ` ab ibn ` Umair was sent to Yathrib (now Medina) to teach the people the doctrines of Muslim and give them guidance.
Mus ` ab ibn ` Umair was the first Muslim envoy in September 621. He was sent to Yathrib (now Medina) to teach the people the doctrines of Islam and give them guidance.