And Moses wrote down all the words of the LORD. Early the next morning he got up and built an altar at the base of the mountain, along with twelve pillars for the twelve tribes of Israel.
Jewish Publication Society of America Version (JPS1917) - Exodus 24:4 >And Moses wrote all the words of the LORD, and rose up early in the morning, and builded an altar under the mount, and twelve pillars, according to the twelve tribes of Israel.