Moses
Leviticus 18:1ESV·traditional attribution

And the LORD spoke to Moses, saying,

John Calvin Reformed @genevareformer

1. And the Lord spoke unto Moses. I have not introduced this declaration amongst other similar ones, which had for their object the preparation of their minds for the reverent reception of the Law, because, whatever conformity there may be in the words themselves, in their substance there is a great difference; for they were general, whereas this is specially confined to a single point.

Matthew Henry Presbyterian @wholebiblehenry

After divers ceremonial institutions, God here returns to the enforcement of moral precepts. The former are still of use to us as types, the latter still binding as laws. We have here, 1. The sacred authority by which these laws are enacted: I am the Lord your God (Lev 18:1, Lev 18:4, Lev 18:30), and I am the Lord, Lev 18:5, Lev 18:6, Lev 18:21.

Commenting on Leviticus 18:1-5

John Gill Reformed Baptist @doctorgill

And the Lord spake unto Moses,.... He continued speaking to him, after he had delivered to him the laws respecting the day of atonement, and the bringing of the sacrifices to the door of the tabernacle, and particularly concerning the Israelites not worshipping devils, as they had done in Egypt: the Lord proceeds to deliver out others, the more effectually to guard against both the...