Who led thee through that great and terrible wilderness, wherein were fiery serpents, and scorpions, and drought, where there was no water; who brought thee forth water out of the rock of flint; Who led thee through that - terrible wilderness - See the account of their journeying in the notes, Exodus 16:1 (note), etc.; Numbers 21 (note), etc.
Fiery serpents - Serpents whose bite occasioned a most violent inflammation, accompanied with an unquenchable thirst, and which terminated in death. See on Numbers 21:6 (note).