 Conditions of the pledge, many of which similar to the first, included obedience to Muhammad, "enjoining good and forbidding evil" as well as responding to the call to arms when required.Some western academics are noted to have questioned whether or not a second pledge had taken place, although Watt argues that there must have been several meetings between the pilgrims and Muhammad on which the basis of his move to Medina could be agreed upon.The demography of Medina before Muslim migration consisted mainly of two pagan Arab tribes; the Banu Aus and the Banu Khazraj; and at least three Jewish tribes