Moses
Deuteronomy 17:6BSB·traditional attribution

On the testimony of two or three witnesses a man shall be put to death, but he shall not be executed on the testimony of a lone witness.

John Calvin Reformed @genevareformer

As His severity in exacting punishment, where murder has been unquestionably committed, shows how highly God rates the life of men, so the qualification, which we find here, declares, that he takes equal care for the preservation of innocent blood.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A law for preserving the honour of God's worship, by providing that no creature that had any blemish should be offered in sacrifice to him, Deu 17:1. This caveat we have often met with: Thou shalt not sacrifice that which has any blemish, which renders it unsightly, or any evil matter or thing (as the following word night better be rendered), any...

Commenting on Deuteronomy 17:1-7

John Gill Reformed Baptist @doctorgill

At the mouth of two witnesses, or three witnesses, shall he that is worthy of death be put to death,.... The idolater found guilty was to be stoned; two witnesses were sufficient to prove a fact, if three the better, but, on the testimony of one, sentence might not be pronounced.