"Joshua son of Nun was mighty in war and was the successor of Moses in the prophetic office." (Sirach 46:1)
Joshua son of Nun was mighty in war and was the successor of Moses in the prophetic office. He became, as his name implies, a great deliverer of God's elect, to take vengeance on the enemies that rose against them, so that he might give Israel its inheritance. How glorious he was when he lifted his hands and brandished his sword against the cities! Before him no one ever stood firm, for he was waging the wars of the Lord. Was it not through him that the sun stood still and one day became as long as two? He called upon the Most High, the Mighty One, when enemies pressed on him from every side. Caleb also is praised for his loyalty in remaining faithful in the midst of the general faithlessness, and the judges who did not fall into idolatry are remembered.
The Catechism identifies the chain of faithful leaders praised in Sirach's hymn as the model of the apostolic succession: each generation receiving the office and the faithfulness from the previous one (CCC 861).
Brothers and sisters, Joshua was the successor of Moses in the prophetic office - faithful to the one he followed, yet himself. The chain of faithful succession requires both fidelity to what was received and the distinctiveness of the person who receives it. Receive what was handed to you faithfully, and bring yourself to it. Both are required.
Lord God, raise up in every generation a Joshua who is faithful to Moses and yet himself - a deliverer for the times. Through Christ our Lord. Amen.