Joshua 6:2

But the Jews are sure to say that ever since this precept was given through Moses, the observance has been binding. But it is clear according to the text that the precept was not eternal or spiritual but temporary, which would one day cease. In short, so true is it that it is not in the exemption from work of the sabbath—that is, of the seventh day—that the celebration of this solemnity is to consist, that Joshua the son of Nun, at the time that he was reducing the city Jericho by war, stated that he had received from God a precept to order the people that priests should carry the ark of the testament of God seven days, making the circuit of the city; and thus, when the seventh day's circuit had been performed, the walls of the city would spontaneously fall. This was done. When the space of the seventh day was finished, just as was predicted, down fell the walls of the city. [By this] it is manifestly shown that in the number of the seven days there intervened a Sabbath day. For seven days, whenever they may have commenced, must necessarily include within them a Sabbath day; on which day not only must the priests have worked, but the city must have been made a prey by the edge of the sword by all the people of Israel.

Though we appear unarmed in body, we nonetheless are bearing arms with which even in time of sunny peace we grapple in spirit against the unsubstantial foe. Now we need God to help us, and him only we must fear; without him our armor falls from us, but with him our armor gains strength. He will be your tower within the walls; he will be your wall where there are no walls.Let us hereafter recall the deeds of our ancestors recorded in the consecrated books. Observe who had the better protection—those enclosed in a city girded by great walls but without God, or those defended by God's strength and friendly support but without city walls. I refer to the city destroyed by the eager Joshua, whose own name was changed to delineate his power. He did not subdue it in the usual military way, by conducting the regular long and weary blockade. No, through God's help his army in sacred symbolism performed a lustration, brandishing its weapons without using them. It withdrew its violence; its arms were silent. For seven days they made seven repeated circuits round the walls. By the strength of this powerful number and by the fearful din of the priests' trumpets, which aped the flashing thunder of divine wrath, they laid hold of the enemy trapped within. Then that people which trusted in its wealth and city perished, and their graves were mingled with their houses.