 In Yathrib, where he was accepted as an arbitrator among the different communities of the city under the terms of the Constitution of Medina, Muhammad began to lay the foundations of the new Islamic society, with the help of new Quranic verses which provided guidance on matters of law and religious observance.The surahs of this period emphasized his place among the long line of Biblical prophets, but also differentiated the message of the Quran from Christianity and Judaism.Armed conflict with Meccans and Jewish tribes of the Yathrib area soon broke out.