Ata Khurasani (may Allah have mercy on him) says: Tustar was conquered through a peace treaty, then the people of Tustar reverted to disbelief. The Muhajirun attacked them and married their women, to the extent that children were born to them. I saw their children. Umar ibn al-Khattab (may Allah be pleased with him) ordered that those who could be identified should be returned to their jizya and separated from their masters.