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.
Neither shalt thou go up by steps unto mine altar, that thy nakedness be not discovered thereon.Exodus 20:26 KJV
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 all places where I record my name I will come unto thee, and I will bless thee.Exodus 20:24 KJV