Exodus 20:24-26

Young's Literal Translation

²⁴ `An altar of earth thou dost make for Me, and thou hast sacrificed on it thy burnt-offerings and thy peace-offerings, thy flock and thy herd; in every place where I cause My name to be remembered I come in unto thee, and have blessed thee.

²⁵ `And if an altar of stones thou dost make to Me, thou dost not build them of hewn work; when thy tool thou hast waved over it, then thou dost pollute it;

²⁶ neither dost thou go up by steps on Mine altar, that thy nakedness be not revealed upon it.