Economical motivations according to Peters also existed since the poorness of the Meccan migrants was a source of concern for Muhammad.[41] Peters argues that Muhammad's treatment of the Jews of Medina was "quite extraordinary" and is "quite at odds with Muhammad's treatment of the Jews he encountered outside Medina."[42] According to Welch, Muhammad's treatment of the three major Jewish tribes brought Muhammad closer to his goal of organizing a community strictly on a religious basis.[43]