Shariya za Musa zalaviwa kutsupira alavyadzi-sadaka, yani atu a chivyazi cha Lawi. Ela kazi za alavyadzi-sadaka taziyatosha chikamilifu kpwa malengoge gosi. Kpwa hivyo phakala na haja phakale na mlavyadzi-sadaka wanjina akale sawa na ulavyadzi-sadaka wa Melikisedeki ambao si sawa na wa Aruni.