This is the Aramaic form of Moses' name, appearing in Ezra 6:18: "And they set the priests in their divisions and the Levites in their divisions, for the service of God at Jerusalem, as it is written in the Book of Moses." The reference grounds post-exilic temple organization in Mosaic authority—the Torah's prescriptions remain binding after the exile. Using the Aramaic form reflects the linguistic context of the Persian period, when Aramaic was the imperial administrative language. Moses functions here not primarily as historical person but as shorthand for authoritative Scripture: "the Book of Moses" means the Pentateuchal law that governs temple service.