dat denotes a binding law, rule, or issued decree, especially in royal administration.

The term denotes a binding law or prescribed rule, most often an official royal measure that is issued, written, announced, or enforced; the same usage also appears for the laws of peoples and for the fiery law described in Deuteronomy.

1. Binding law, rule, or decree · dominant

   The noun identifies an authoritative requirement or enactment: in Esther 3:14 the APB renders a copy of an edict as being issued "as law" throughout every province, and Esther 4:11 describes a rule governing unauthorized entry into the king's inner court. It also occurs for laws belonging to peoples and kings in Esther 3:8, for measures delivered to officials in Ezra 8:36, and for the fiery law in Deuteronomy 33:2.

   Esther 3:14Esther 4:11Esther 3:8Esther 1:19Ezra 8:36Deuteronomy 33:2

In the Anselm Project Bible: Across the verses, the APB commonly presents the term with "law" or "laws," while nearby clauses may call the associated written measure an "edict" or "decree." Those varied English labels describe the verse’s legal setting rather than establish separate meanings.