The Saʿada (singular Saʿdawi) and Murabtin (singular Murabit) form a twofold social division within the Bedouins of western Egypt and eastern Libya. In modern times, the term Murabit contrasts with Saʿdawi and marks a division of social status among the Bedouin component of the population of this region, where the Murabtin are of lower status. The existence of such a division is a sensitive issue, and its continued observation in Matruh is discouraged by the Egyptian government. Likewise, categorization of the Murabtin as Arab Bedouins. The etymology of murābiṭ is unclear.
https://en.wikipedia.org/wiki/Sa%CA%BFada_and_Murabtin