I beg the Reader not to overlook the plainness to be observed in the building of this altar: nothing of human art or labour was to be joined with it, nor any human tool to pollute it. And as CHRIST is our altar, was not this manifestly teaching that his purity would be sullied, if we bring to it anything of our own to mingle with it? He is the stone cut out of the mountain without hands: Daniel 2:34.
Related Commentaries of Deuteronomy 27:5
Deuteronomy 27:5-6
5 And there shalt thou build an altar unto the LORD thy God, an altar of stones: thou shalt not lift up any iron tool upon them.
6 Thou shalt build the altar of the LORD thy God of whole stones: and thou shalt offer burnt offerings thereon unto the LORD thy God: