Moses
Leviticus 19:1BSB·traditional attribution

Then the LORD said to Moses,

John Calvin Reformed @genevareformer

1. And the Lord spake. This is the object of the exhortation: first, that they should not measure the service of God by their own conceits, but rather by His nature; and secondly, that they should begin by studying “Pour le servir deuement, ils commencent par ce bout, de se purifier de toutes souillures;” in order to serve Him duly, they should begin by purifying...

Matthew Henry Presbyterian @wholebiblehenry

Moses is ordered to deliver the summary of the laws to all the congregation of the children of Israel (Lev 19:2); not to Aaron and his sons only, but to all the people, for they were all concerned to know their duty. Even in the darker ages of the law, that religion could not be of God which boasted of ignorance as its mother.

Commenting on Leviticus 19:1-10

John Gill Reformed Baptist @doctorgill

And the Lord spake unto Moses,.... About the same, or quickly after he had delivered the above laws to him; and there are many in this chapter, which were before given, and here repeated: saying; as follows.