Exodus 20:25

Overview - Exodus 20
The ten commandments are spoken by Jehovah.
18 The people are afraid, but Moses comforts them.
21 Idolatry is forbidden.
23 Of what sort the altar should be.
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Exodus 20:25  (King James Version)
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.

Deuteronomy 27:5 Deuteronomy 27:6 ; Joshua 8:31

build it of hewn stone
Hebrew build them with hewing.