Twelve pillars - As the altar was a symbol of the presence of Yahweh, so these twelve pillars represented the presence of the Twelve tribes with whom He was making the covenant.

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.

And Moses wrote all the words of the Lord,.... Jarchi says, all from the creation, to the giving of the law, and the commands at Marah; but though these were written by him, yet not at this time; but as Aben Ezra more truly observes, what are mentioned in this "parashah", or section, or what is contained in the two preceding chapters, he not only related to them from his memory, but he wrote them in a book, which is after mentioned, that they might be seen and read hereafter; for these were not the ten commands, they were written as well as spoken by the Lord himself, but the judicial laws before mentioned:

and rose up early in the morning: not on the fifth of Sivan, as Jarchi, the day before the giving of the law, but on the eighth of that month, two days after it:

and built an altar under the hill: under Mount Sinai, about the place where the bounds were set, beyond which the people were not to go:

and twelve pillars, according to the twelve tribes of Israel: to answer to them, and which were to represent them, as seems by the following account; these probably were made of marble stone, of which Mount Sinai consisted, and of which there was plenty thereabout.

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.

24:4 And Moses wrote the words of the Lord - That there might be no mistake; as God dictated them on the mount, where, it is highly probable, God taught him the use of letters. These Moses taught the Israelites, from whom they afterwards travelled to Greece and other nations. As soon as God had separated to himself a peculiar people, he governed them by a written word, as he has done ever since, and will do while the world stands. Pillars according to the number of the tribes - These were to represent the people, the other party to the covenant; and we may suppose they were set up over against the altar, and that Moses as mediator passed to and fro between them. Probably each tribe set up and knew its own pillar, and their elders stood by it. He then appointed sacrifices to be offered upon the altar.

Margin builded

Cf. Ex 33:7-11. This arrangement for worship was temporarily called the "tabernacle."

24:1-8 A solemn covenant was made between God and Israel. Very solemn it was, typifying the covenant of grace between God and believers, through Christ. As soon as God separated to himself a peculiar people, he governed them by a written word, as he has done ever since. God's covenants and commands are so just in themselves, and so much for our good, that the more we think of them, and the more plainly and fully they are set before us, the more reason we may see to comply with them. The blood of the sacrifice was sprinkled on the altar, on the book, and on the people. Neither their persons, their moral obedience, nor religious services, would meet with acceptance from a holy God, except through the shedding and sprinkling' of blood. Also the blessings granted unto them were all of mercy; and the Lord would deal with them in kindness. Thus the sinner, by faith in the blood of Christ, renders willing and acceptable obedience.