Matthew met with Behnam and Sarah outside of the city of Assur and healed her affliction. Behnam, Sarah, and forty slaves subsequently converted to Christianity and the saint baptised them. Following this, Matthew returned to his cave on Mount Alfaf. Sinharib discovered his children's conversion and the group suffered martyrdom as they attempted to flee to Matthew on Mount Alfaf. The king became afflicted with madness and was brought to the place of the martyrs' death by Behnam's mother. Matthew met Sinharib and the queen here and healed the king of his madness. They returned to Assur and the saint baptised Sinharib and his wife, and, at the request of Matthew, the king constructed a monastery on Mount Alfaf, which later became known as the Monastery of St. Matthew. Matthew resided at the monastery until his death and was buried there.