Moses
Deuteronomy 10:17ESV·traditional attribution

For the LORD your God is God of gods and Lord of lords, the great, the mighty, and the awesome God, who is not partial and takes no bribe.

John Calvin Reformed @genevareformer

17. For the Lord your God. Lest they should despise this teaching, he reminds them of God’s awful power; for the cause of contempt and negligence is, that the majesty of God does not always obtain its due reverence. Wherefore he inspires them with fear, to deter them from self-indulgence and indifference. DEUTERONOMY 27 Deuteronomy 27:9, 10 9.

Matthew Henry Presbyterian @wholebiblehenry

Here is a most pathetic exhortation to obedience, inferred from the premises, and urged with very powerful arguments and a great deal of persuasive rhetoric. Moses brings it in like an orator, with an appeal to his auditors And now, Israel, what doth the Lord thy God require of thee? Deu 10:12. Ask what he requires; as David (Psa 116:12), What shall I render?

Commenting on Deuteronomy 10:12-22

John Gill Reformed Baptist @doctorgill

For the Lord your God is God of gods,.... Of angels and civil magistrates, who are sometimes so called: these are his creatures, act for him and under him, and are accountable to him: the Lord of lords; of the kings and princes of the earth, who have their crowns, sceptres, and kingdoms from him, and hold them of him, by and under whom they...