Jamieson, Fausset and Brown on Exodus 17:2-3

2-3. the people did chide with Moses, and said, Give us water that we may drink, &c.--The want of water was a privation, the severity of which we cannot estimate, and it was a great trial to the Israelites, but their conduct on this new occasion was outrageous; it amounted even to "a tempting of the Lord." It was an opposition to His minister, a distrust of His care, an indifference to His kindness, an unbelief in His providence, a trying of His patience and fatherly forbearance.