all the four caliphs in general, and of the companions Abu Bakr, "Umar and "Uthman in particular, because it was in their period that
ការ Caliphate បួន នាក់ នៅ ក្នុង ទូទៅ, និង ដៃគូ ទីក្រុង Abu Bakr នេះ " Umar