World Wide Study Bible
a Bible passage
15. 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.
who brought thee forth water out of the rock of flint—(See on De 9:21).