Exodus 24:3-4

And Moses came and told the people all the words of Jehovah, and all the ordinances: and all the people answered with one voice, and said, All the words which Jehovah hath spoken will we do. And Moses wrote all the words of Jehovah, and rose up early in the morning, and builded an altar under the mount, and twelve pillars, according to the twelve tribes of Israel.