Moses
Deuteronomy 8:15BSB·traditional attribution

He led you through the vast and terrifying wilderness with its venomous snakes and scorpions, a thirsty and waterless land. He brought you water from the rock of flint.

Matthew Henry Presbyterian @wholebiblehenry

Moses, having mentioned the great plenty they would find in the land of Canaan, finds it necessary to caution them against the abuse of that plenty, which was a sin they would be the more prone to new that they came into the vineyard of the Lord, immediately out of a barren desert. I. He directs them to the duty of a prosperous condition, Deu 8:10.

Commenting on Deuteronomy 8:10-20

John Gill Reformed Baptist @doctorgill

Who fed thee in the wilderness with manna,.... Even all the forty years they were in it, Exo 16:35 which thy fathers knew not; when they first saw it, Exo 16:15. that he might humble thee, and that he might prove thee; they were kept humble, being dependent on God for their daily bread, having nothing in the wilderness to support themselves with; and this...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Who led thee through that great and terrible wilderness, wherein were fiery serpents, and scorpions--Large and venomous reptiles are found in great numbers there still, particularly in autumn. Travellers must use great caution in arranging their tents and beds at night; even during the day the legs not only of men, but of the animals they ride, are liable to be bitten.