Moses
Deuteronomy 6:14ESV·traditional attribution

You shall not go after other gods, the gods of the peoples who are around you—

John Calvin Reformed @genevareformer

14. Ye shall not go after. In this passage Moses commands the people not to turn away from the simple service of God, although examples of superstition may present themselves to their sight on every side. For this was a very destructive temptation, that none could be anywhere found who subscribed to the doctrine of the Law, although the respective nations had some religion, or...

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. A brief summary of religion, containing the first principles of faith and obedience, Deu 6:4, Deu 6:5. These two verses the Jews reckon one of the choicest portions of scripture: they write it in their phylacteries, and think themselves not only obliged to say it at least twice every day, but very happy in being so obliged, having this saying among them...

Commenting on Deuteronomy 6:4-16

John Gill Reformed Baptist @doctorgill

Ye shall not go after other gods,.... To serve and worship them, and swear by them; and which indeed are no gods, only nominal and fictitious ones; idols which are nothing in the world, and ought to have no veneration and adoration given them; to go after them is to worship them, and this is to depart from the true God, and go a whoring...