Moses
Exodus 6:6ESV·traditional attribution

Say therefore to the people of Israel, ‘I am the LORD, and I will bring you out from under the burdens of the Egyptians, and I will deliver you from slavery to them, and I will redeem you with an outstretched arm and with great acts of judgment.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. God silences Moses's complaints with the assurance of success in this negotiation, repeating the promise made him in Exo 3:20, After that, he will let you go. When Moses was at his wit's end, wishing he had staid in Midian, rather than have come to Egypt to make bad worse - when he was quite at a loss what to do - Then...

Commenting on Exodus 6:1-9

John Gill Reformed Baptist @doctorgill

And I will take you to me for a people,.... Out of the hands of the Egyptians, and out of their country, to be in a political sense his kingdom and subjects; and in a religious sense a holy people to himself, to fear, serve, worship, and glorify him, by walking according to laws and rules given them by him; and this he did by...

Adam Clarke Methodist @methodicalclarke

Say unto the children of Israel, I am the Lord, and I will bring you out, etc. - This confirms the explanation given of Exo 6:3, which see Clarke's note on Exo 6:3.