Here we have the gracious answer of GOD to the supplication of Moses, in appointing a successor, and ordaining him to the arduous office. Joshua had, before this, been eminently distinguished in the battle with Amalek: see Exodus 17:9-14. and in the instance of espying out the promised land: see Numbers 14:6-10 and now the LORD calls him forth to a more eminent degree of usefulness.
Related Commentaries of Numbers 27:18
Numbers 27:18-21
18 And the LORD said unto Moses, Take thee Joshua the son of Nun, a man in whom is the spirit, and lay thine hand upon him;
19 And set him before Eleazar the priest, and before all the congregation; and give him a charge in their sight.
20 And thou shalt put some of thine honour upon him, that all the congregation of the children of Israel may be obedient.
21 And he shall stand before Eleazar the priest, who shall ask counsel for him after the judgment of Urim before the LORD: at his word shall they go out, and at his word they shall come in, both he, and all the children of Israel with him, even all the congregation.