who led thee through the great and terrible wilderness, wherein were fiery serpents and scorpions, and thirsty ground where was no water; who brought thee forth water out of the rock of flint;

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.

who is causing thee to go in the great and the terrible wilderness--burning serpent, and scorpion, and thirst--where there is no water; who is bringing out to thee waters from the flinty rock;

who led thee through the great and terrible wilderness, [a wilderness of] fiery serpents, and scorpions, and drought, where there is no water; who brought thee forth water out of the rock of flint;