Moses
Numbers 21:7ESV·traditional attribution

And the people came to Moses and said, “We have sinned, for we have spoken against the LORD and against you. Pray to the LORD, that he take away the serpents from us.” So Moses prayed for the people.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The fatigue of Israel by a long march round the land of Edom, because they could not obtain passage through it the nearest way: The soul of the people was much discouraged because of the way, Num 21:4.

Commenting on Numbers 21:4-9

John Gill Reformed Baptist @doctorgill

Therefore the people came to Moses, and said, we have sinned,.... Being bitten with serpents, and some having died, the rest were frightened, and came and made an humble acknowledgment of their sins to Moses: for we have spoken against the Lord, and against thee; murmuring at their being brought out of Egypt, and because they had no better provision in the wilderness; concluding they...

Jamieson-Fausset-Brown Reformed @jfbcommentary

the people came to Moses, and said, We have sinned--The severity of the scourge and the appalling extent of mortality brought them to a sense of sin, and through the intercessions of Moses, which they implored, they were miraculously healed.