Num 27:12-23 The LORD said to Moses, “Go up into this mountain of Abarim and see the land that I have given to the people of Israel. When you have seen it, you also shall be gathered to your people, as your brother Aaron was, because you rebelled against my word in the wilderness of Zin when the congregation quarreled, failing to uphold me as holy at the waters before their eyes.” (These are the waters of Meribah of Kadesh in the wilderness of Zin.) Moses spoke to the LORD, saying, “Let the LORD, the God of the spirits of all flesh, appoint a man over the congregation who shall go out before them and come in before them, who shall lead them out and bring them in, that the congregation of the LORD may not be as sheep that have no shepherd.” So the LORD said to Moses, “Take Joshua the son of Nun, a man in whom is the Spirit, and lay your hand on him. Make him stand before Eleazar the priest and all the congregation, and you shall commission him in their sight. You shall invest him with some of your authority, that all the congregation of the people of Israel may obey. And he shall stand before Eleazar the priest, who shall inquire for him by the judgment of the Urim before the LORD. At his word they shall go out, and at his word they shall come in, both he and all the people of Israel with him, the whole congregation.” And Moses did as the LORD commanded him. He took Joshua and made him stand before Eleazar the priest and the whole congregation, and he laid his hands on him and commissioned him as the LORD directed through Moses.
Moses explained that he did – on some occasion – ask God to relent from His judgment that Moses would never set foot in the land of Canaan. God did not relent, and Moses made himself content with knowing he would see the land and be gathered to His God. God reminded Moses of the reason why he would not be allowed to enter Canaan, because of his sin of misrepresenting God at Meribah. After hearing of his coming fate, Moses did not try to change God’s mind, and he did not complain. His only concern was for the congregation of Israel, for the people, not for himself. (Guzik)
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. (Henry)