Moses
Numbers 27:21BSB·traditional attribution

He shall stand before Eleazar the priest, who will seek counsel for him before the LORD by the judgment of the Urim. At his command, he and all the Israelites with him—the entire congregation—will go out and come in.”

John Calvin Reformed @genevareformer

21. And he shall stand before Eleazar the priest. Joshua is here subordinated to the priest on one point, viz., to inquire of him by the Urim and Thummim: for, as we have seen before, See on Exodus 28:4, vol 2, p. 196.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. Moses prays for a successor. When God had told him that he must die, though it appears elsewhere that he solicited for a reprieve for himself (Deu 3:24, Deu 3:25), yet, when this could not be obtained, he begged earnestly that the work of God might be carried on, though he might not have the honour of finishing it.

Commenting on Numbers 27:15-23

John Gill Reformed Baptist @doctorgill

And Moses did as the Lord commanded him,.... Being faithful and obedient to him in all things, though ever so contrary to his own private interest and to that of his family: and he took Joshua and set him before Eleazar the priest, and before all the congregation; as his successor, whom God had named and appointed as such.