The Nazarites had much in common with the ultra-strict and ferocious Rechabites, who engaged in massacres of backsliders when opportunity offered. Such sects were the most extreme monotheists and iconoclasts. They tended to drift into semi-nomad life on the fringe of the desert, a featureless place conducive to strict monotheism. It was from such a background that the greatest of all Jewish sectarian heresies was to spring–Islam.156
