C. F. Keil and Franz Delitzsch on Ezra 7:14

Ezr 7:14 “Forasmuch as thou (art) sent by the king and his seven counsellors to inquire (to institute an inquiry) concerning Judah and Jerusalem, according to the law of thy God, which is in thy hand,” i.e., which thou handlest or possessest and understandest. The seven counsellors of the king formed the supreme court of the realm; see remarks on Est 1:14. It is obvious from the context that שׁליח must be completed by אנתּ, for it is evidently Ezra who is addressed both in what precedes and follows. על בּקּרה, to inquire concerning (the condition of) Judah, i.e., concerning the religious and civil relations of the Jewish community, to arrange them in conformity with the divine law.