5 There shall you build an altar to Yahweh your God, an altar of stones: you shall lift up no iron [tool] on them.
Then Joshua built an altar to Yahweh, the God of Israel, in Mount Ebal, as Moses the servant of Yahweh commanded the children of Israel, as it is written in the book of the law of Moses, an altar of uncut stones, on which no man had lifted up any iron: and they offered thereon burnt offerings to Yahweh, and sacrificed peace-offerings.
Elijah took twelve stones, according to the number of the tribes of the sons of Jacob, to whom the word of Yahweh came, saying, Israel shall be your name. With the stones he built an altar in the name of Yahweh; and he made a trench about the altar, as great as would contain two measures of seed.
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Commentary on Deuteronomy 27 Matthew Henry Commentary
Chapter 27
Moses having very largely and fully set before the people their duty, both to God and one another, in general and in particular instances,-having shown them plainly what is good, and what the law requires of them,-and having in the close of the foregoing chapter laid them under the obligation both of the command and the covenant, he comes in this chapter to prescribe outward means,
Deu 27:1-10
Here is,
Deu 27:11-26
When the law was written, to be seen and read by all men, the sanctions of it were to be published, which, to complete the solemnity of their covenanting with God, they were deliberately to declare their approbation of. This they were before directed to do (ch. 11:29, 30), and therefore the appointment here begins somewhat abruptly, v. 12. There were, it seems, in Canaan, that part of it which afterwards fell to the lot of Ephraim (Joshua's tribe), two mountains that lay near together, with a valley between, one called Gerizim and the other Ebal. On the sides of these two mountains, which faced one another, all the tribes were to be drawn up, six on one side and six on the other, so that in the valley, at the foot of each mountain, they came pretty near together, so near as that the priests standing betwixt them might be heard by those that were next them on both sides; then when silence was proclaimed, and attention commanded, one of the priests, or perhaps more at some distance from each other, pronounced with a loud voice one of the curses here following, and all the people that stood on the side and foot of Mount Ebal (those that stood further off taking the signal from those that stood nearer and within hearing) said Amen; then the contrary blessing was pronounced, "Blessed is he that doth not so or so,' and then those that stood on the side, and at the foot, of Mount Gerizim, said Amen. This could not but affect them very much with the blessings and curses, the promises and threatenings, of the law, and not only acquaint all the people with them, but teach them to apply them to themselves.