And Moses did as the LORD commanded him: and he took Joshua, and set him before Eleazar the priest, and before all the congregation:

Wesley's Notes

27:22 And Moses did as the Lord commanded him - It had been little to resign his honour to a son of his own. But with his own hands, first to ordain Eleazar high - priest, and now Joshua chief ruler, while his own children had no preferment at all, but were left in the rank of common Levites: this was more to his glory than the highest advancement of his family could have been. This shews him to have had a principle which raised him above all other lawgivers, who always took care to establish their families in some share of the greatness themselves possessed.

Matthew Henry's Concise Commentary

27:15-23 Envious spirits do not love their successors; but Moses was not one of these. We should concern ourselves, both in our prayers and in our endeavours, for the rising generation, that religion may be maintained and advanced, when we are in our graves. God appoints a successor, even Joshua; who had signalized himself by his courage in fighting Amalek, his humility in ministering to Moses, and his faith and sincerity in witnessing against the report of the evil spies. This man God appoints to succeed Moses; a man in whom is the Spirit, the Spirit of grace. He is a good man, fearing God and hating covetousness, and acting from principle. He has the spirit of government; he is fit to do the work and discharge the trusts of his place. He has a spirit of conduct and courage; he had also the Spirit of prophecy. That man is not fully qualified for any service in the church of Christ, who is destitute of the graces and gifts of the Holy Spirit, whatever human abilities he may possess. And in Joshua's succession we are reminded that the law was given by Moses, who by reason of our transgression could not bring us to heaven; but grace and truth came by Jesus Christ, for the salvation of every believer.