Joshua 5:2

“At that time the Lord said unto Joshua, etc.] When the people had passed over Jordan, and had pitched in Gilgal, and Joshua had set up the stones there; and particularly when the dread of them had seized the inhabitants of Canaan, and deprived them of all their courage; and so was a fit time for the execution of what is next ordered, and seems designed in the providence of God among other things particularly for that: make them sharp knives; not that Joshua was to make them himself, but to order them to be made; for a considerable number would be wanted for the use to be made of them: the Targum calls them sharp razors; and Ben Gersom says they were made of brass, more likely of iron or…”

“CIRCUMCISION IS RENEWED. (Jos 5:2-12) At that time--on the encampment being made after the passage. the Lord said unto Joshua, Make thee sharp knives--Stone knives, collect and make them ready. Flints have been used in the early times of all people; and although the use of iron was known to the Hebrews in the days of Joshua, probably the want of a sufficient number of metallic implements dictated the employment of flints on this occasion (compare Exo 4:25). circumcise again the children of Israel the second time--literally, "return and circumcise." The command did not require him to repeat the operation on those who had undergone it, but to resume the observance of the rite, which had been…”

“Make thee sharp knives - Render rather as marg., and compare marginal reference and note. Knives of flint or stone were in fact used for circumcision, and retained for that and other sacred purposes, even after iron had become in common use. The rendering of the margin is adopted by almost all ancient versions, by most commentators, and by the fathers generally, who naturally regarded circumcision performed by Joshua and by means of knives of stone or rock, as symbolic of the true circumcision performed by Christ, who is more than once spoken of as the Rock (compare 1 Corinthians 10:4; Romans 2:29; Colossians 2:11). See Joshua 21:42. Circumcise again ... - i. e. make that which once was a…”

“At that time - As soon as ever they were come to Gilgal, which was on the tenth day; and so this might be executed the eleventh day, and that in the morning: on the thirteenth day they were sore of their wounds, and on the fourteenth day they recovered, and at the even of that day kept the passover. Make - Or, prepare, or make ready, as this word sometimes used. As it was not necessary for those who had such knives already to make others for that use; so it is not probable that such were commanded to do so, but only to make them sharp and fit for that work. The second time - He calleth this a second circumcision, not as if these same persons had been circumcised before, but with respect to…”

“5:2 Before the Israelites turned their attention to Jericho, God directed Joshua to perform the covenant renewal ceremony of circumcising all the males born in the forty years since the exodus from Egypt. Because the land was part of the covenant promise, Israel’s men needed to demonstrate their personal participation in the covenant through circumcision in order to enter into the land. • Flint is found in a natural state, so flint knives were mandated for circumcision as a symbol of purity or holiness.”

“sharp knives: or, knives of flints, Before the use of iron was common, all the nations of the earth had their edge tools made of stones, flints, etc. Our ancestors had their arrows and spearheads made of flint; which are frequently turned up by the plough. And even when iron became more common, stone knives seem to have been preferred for making incisions in the human body. The Egyptians used such to open the bodies for embalming; and the tribe of Alnajab in Ethiopia, who follow the Mosaic institution, perform the rite of circumcision, according to Ludolf, cultris lapidibus, with knives made of stone. circumcise: Gen 17:10-14; Deu 10:16, Deu 30:6; Rom 2:29, Rom 4:11; Col 2:11 Joshua 5:3”