Moses
Exodus 4:14ESV·traditional attribution

Then the anger of the LORD was kindled against Moses and he said, “Is there not Aaron, your brother, the Levite? I know that he can speak well. Behold, he is coming out to meet you, and when he sees you, he will be glad in his heart.

John Calvin Reformed @genevareformer

14. And the anger of the Lord was kindled. This passage confirms, by opposition, that expression, that there is no better sacrifice than to obey the voice of the Lord, (1 Samuel 15:22,) since God is so grievously offended with the hesitation of Moses, in spite of his specious excuses.

Matthew Henry Presbyterian @wholebiblehenry

Moses still continues backward to the service for which God had designed him, even to a fault; for now we can no longer impute it to his humility and modesty, but must own that here was too much of cowardice, slothfulness, and unbelief in it. Observe here, I. How Moses endeavours to excuse himself from the work. 1. He pleads that he was no good spokesman: O my Lord!

Commenting on Exodus 4:10-17

John Gill Reformed Baptist @doctorgill

And the anger of the Lord was kindled against Moses,.... For the objections, excuses, and delays he made with respect to his mission. In what way this anger was expressed is not easy to say, whether by not removing the impediment of his speech, or not giving him the priesthood, which Jarchi thinks he otherwise would have had, and Aaron been only a Levite, as...