EX 17:3-7

In those days, in their thirst for water,
the people grumbled against Moses,
saying, "Why did you ever make us leave Egypt?
Was it just to have us die here of thirst 
with our children and our livestock?"
So Moses cried out to the LORD, 
"What shall I do with this people?
a little more and they will stone me!"
The LORD answered Moses,
"Go over there in front of the people, 
along with some of the elders of Israel, 
holding in your hand, as you go, 
the staff with which you struck the river.
I will be standing there in front of you on the rock in Horeb.
Strike the rock, and the water will flow from it 
for the people to drink."
This Moses did, in the presence of the elders of Israel.
The place was called Massah and Meribah, 
because the Israelites quarreled there
and tested the LORD, saying,
"Is the LORD in our midst or not?"