The stones used in the construction of the Temple were finished at the quarry, so there was no sound of hammer, ax, or any other iron tool at the building site.
If you use stones to build my altar, use only natural, uncut stones. Do not shape the stones with a tool, for that would make the altar unfit for holy use.
Then Moses carefully wrote down all the Lord’s instructions. Early the next morning Moses got up and built an altar at the foot of the mountain. He also set up twelve pillars, one for each of the twelve tribes of Israel.