The New Testament makes one argument from Joshua, and it makes it from his name. Hoshea means salvation. Moses put the divine name in front of it and made it Joshua, the LORD saves (Numbers 13:16). The Greek Old Testament renders that name Iesous, and that is the name the angel gives to Mary's son at Matthew 1:21, for the reason the same verse states, because He will save His people from their sins. The older English versions make the collision visible almost by accident. The King James prints Jesus at Acts 7:45 and Hebrews 4:8 where the modern versions print Joshua, and Adam Clarke objected to that choice in his note on Hebrews 4:8. Eusebius of Caesarea, early in the fourth century, had already noticed that the name was given to this man first, and given by Moses.
Hebrews 4:8 reads, For if Joshua had given them rest, God would not have spoken later about another day. The argument runs forward rather than backward. Joshua really did bring Israel into the land and really did give them rest, and Joshua 21:45 says that not one of the good promises of the LORD had failed. Generations later God still speaks through David of a rest to be entered today, so the rest Joshua gave was not the last one. Albert Barnes puts it in one sentence, that Joshua gave them a rest in the promised land but it was not all that was intended and it did not shut out the promise of another. Nothing in that argument says Joshua failed, and nothing in it says Israel was replaced. A real rest given to a real people is the ground the whole argument stands on.
Joshua 5:13 to 5:15 is the passage the earliest Christian readers reached for first. The figure carries a drawn sword, calls Himself Commander of the army of the LORD, accepts Joshua's prostration, and calls the ground holy in the words Moses heard at the bush. Justin Martyr, in the middle of the second century, names Him as the one who calls Himself Captain when He appeared in human form to Joshua. Origen of Alexandria, preaching at Caesarea late in his life, asks who else is chief of the army of the powers of God except our Lord Jesus Christ. Eusebius, early in the fourth century, says the identity of words shows this is no other than the one who spoke to Moses. Ambrose of Milan, late in the same century, opens with the question whether Joshua erred in recognizing the leader of the heavenly host. This site teaches that reading, as it teaches the fourth man in the fire at Daniel 3. Albert Barnes read the figure as the prince of the angelic host sent to lead Israel into the coming fight, and he is honored here as a teacher who read the same verses differently.
The old readings of the campaign are readings, and this page gives them as readings. Origen took the fall of Jericho as the fall of this world at the end of the age, with the trumpets of the priests as the preaching of the apostles. Ambrose read the same event as a war brought to an end by faith rather than by engines of war. The Jordan crossing has been read since antiquity as a figure of baptism, and of death passed through into life. Matthew Henry, on Joshua 11:23, states the rest plainly: there is a rest from war remaining for the people of God, into which they enter when their warfare is accomplished. Canaan in that reading is the inheritance given, with a larger inheritance still promised.
Rahab belongs here because Joshua is the man who kept the promise that put her where she stands. Two spies swore an oath to her at Joshua 2:14, and at Joshua 6:22 Joshua sent those same two men to honor it inside a city under the ban. She stands in the genealogy of Jesus at Matthew 1:5, is commended for faith at Hebrews 11:31, and for works at James 2:25. Origen read her joining to Israel through the image Paul uses at Romans 11:17 and 11:18, where a branch of the wild olive is grafted into the root of a good olive and the root carries the branch. The direction of that image is the point. The nations are brought in to a root that was never theirs, and the root is not displaced.
The strongest form of this section is also the most restrained. The New Testament does not call Joshua a type of Christ in so many words, and this page does not put words in its mouth. What the text gives is enough. The name is the same name, and Scripture explains what it means in both cases (Numbers 13:16; Matthew 1:21). A people were brought into an inheritance they had not worked for, and Joshua 24:13 says so in God's own voice. One man went face down in the road before a commander whom the earliest Christian readers named. Matthew Henry closes the life at Joshua 24:31 by calling Christ our Joshua, still with His church by His Spirit. Where this site teaches a reading it teaches it as this site's tradition, and the founder's own slot on this page stays his to fill.