But that also was read to us today, that Moses gave an inheritance to certain men; and after these things it is read that Jesus too, according to the precept of the Lord, distributed the inheritance. First, then, Moses distributed the inheritance, but second Jesus. Now understand Moses as the law. These, then, who lived according to the law received the inheritance first, but outside the land of promise. Then afterward, when they had received the land of inheritance, they do not possess it nor divide it among themselves, but they wait until it is distributed to them by lot through Jesus. Is not this evidently what the Apostle says to the Hebrews, writing about the "former fathers," whom he said "pleased God by faith"? And he added, saying: "but all these, having obtained testimony through faith, did not yet receive the promises, God providing something better for us, that they should not be made perfect without us." They have therefore already their "promise" and have found rest, and have been judged worthy through Moses to take the inheritance; nevertheless they too still fight and are in the contest on behalf of those who serve as soldiers under Jesus. But you ask who these are that fight, and what is that fight which they wage. I judge it thus, that all those "fathers" who "fell asleep" before us fight together with us and help us by their prayers. For so also I heard a certain one of the elder teachers saying, in that place where it is written in Numbers that: "that synagogue shall lick up this synagogue, as a calf licks up the green grass of the field." He said: why was a likeness of this kind taken up, unless because this is what is to be understood in the passage — that the "synagogue" of the Lord, which has gone before us among the saints, shall with mouth and tongue consume the adversary synagogue, that is, shall consume our adversaries with prayers and supplications? Not therefore with arms are we to fight against our invisible enemies, but with prayers and meditations on the word of God and with right works and right thoughts. For so also the fathers were armed, conquering by faith and by works. See, finally, that it is so written of them: "they believed," it says, "God and Moses his servant"; and "then Moses sang this song" and said: "let us sing to the Lord, for he has been gloriously honored." So then let us too, cultivating full faith and perfect works, unceasing prayers, meditation on the divine word, spiritual understanding, and fortified in all these as with the arms of God, "let us stand against the wiles of the devil," calling upon God our helper in Christ Jesus our Lord, "to whom is glory and dominion unto the ages of ages. Amen!"
Source: HOMILIES ON JOSHUA 16.5