John Calvin's Commentary on the Bible - Exodus 20:24
Verse 24 24.An altar of earth thou shalt make. This precept differs from the other, which I have just explained; because although it refers to the choice of a place, (111) yet the mention of a place is omitted, and it only touches upon the material and form of the altar. God, therefore, commands that an altar should be built to Him, either of earth or of a heap of stones, which had not been artificially polished. But I understand this of the altars, which either in the desert or elsewhere... read more
Adam Clarke's Commentary on the Bible - Exodus 20:26
Neither shalt thou go up by steps unto mine altar - The word altar comes from altus , high or elevated, though the Hebrew word מזבח mizbach , from זבח zabach , to slay, kill, etc., signifies merely a place for sacrifice; see Genesis 8:20 . But the heathens, who imitated the rites of the true God in their idolatrous worship, made their altars very high; whence they derived their name altaria , altars, i.e., very high or elevated places; which they built thus, partly through... read more