Thematic Bible: To be made of earth, or unhewn stone

An altar of earth thou shalt make unto me and shalt sacrifice thereon thy burnt offerings and thy peace offerings, thy sheep and thine oxen; in whatever place where I cause my name to be remembered, I will come unto thee, and I will bless thee. And if thou wilt make me an altar of stone, thou shalt not build it of hewn stone; for if thou lift up thy tool upon it, thou hast polluted it.