Moses
Exodus 18:9ESV·traditional attribution

And Jethro rejoiced for all the good that the LORD had done to Israel, in that he had delivered them out of the hand of the Egyptians.

Matthew Henry Presbyterian @wholebiblehenry

Observe here, I. The kind greeting that took place between Moses and his father-in-law, Exo 18:7. Though Moses was a prophet of the Lord, a great prophet, and king in Jeshurun, yet he showed a very humble respect to his father-in-law.

Commenting on Exodus 18:7-12

John Gill Reformed Baptist @doctorgill

And Jethro rejoiced for all the goodness which the Lord had done to Israel,.... In giving them the manna and the well, as the above Targum, bread to eat when hungry, and water to drink when thirsty; to which Jarchi adds, and the law, for he supposes the meeting of Jethro and Moses was after the law was given on Mount Sinai, though here recorded...

Adam Clarke Methodist @methodicalclarke

And Jethro rejoiced for all the goodness - Every part of Jethro's conduct proves him to have been a religious man and a true believer. His thanksgiving to Jehovah (Exo 18:10) is a striking proof of it; he first blesses God for the preservation of Moses, and next for the deliverance of the people from their bondage.