And Moses wrote all the words of the LORD, and rose up early in the morning, and builded an altar under the hill, and twelve pillars, according to the twelve tribes of Israel. Moses wrote all the words of the Lord - After the people had promised obedience, (Exodus 24:3), and so entered into the bonds of the covenant, "it was necessary," says Calmet, "to draw up an act by which the memory of these transactions might be preserved, and confirm the covenant by authentic and solemn ceremonies." And this Moses does.
1. As legislator, he reduces to writing all the articles and conditions of the agreement, with the people's act of consent.
2. As their mediator and the deputy of the Lord, he accepts on his part the resolution of the people; and Jehovah on his part engages himself to Israel, to be their God, their King, and Protector, and to fulfill to them all the promises he had made to their fathers.
3. To make this the more solemn and affecting, and to ratify the covenant, which could not be done without sacrifice, shedding and sprinkling of blood, Moses builds an altar, probably of turf, as was commanded, Exodus 20:24, and erects twelve pillars, no doubt of unhewn stone, and probably set round about the altar. The altar itself represented the throne of God; the twelve stones, the twelve tribes of Israel. These were the two parties, who were to contract, or enter into covenant, on this occasion.