Exodus 17:6

3 and the people thirst there for water, and the people murmur against Moses, and say, `Why [is] this? -- thou hast brought us up out of Egypt, to put us to death, also our sons and our cattle, with thirst.`

4 And Moses crieth to Jehovah, saying, `What do I to this people? yet a little, and they have stoned me.`

5 And Jehovah saith unto Moses, `Pass over before the people, and take with thee of the elders of Israel, and thy rod with which thou hast smitten the River take in thy hand, and thou hast gone:

6 Lo, I am standing before thee there on the rock in Horeb, and thou hast smitten on the rock, and waters have come out from it, and the people have drunk.` And Moses doth so before the eyes of the elders of Israel,

7 and he calleth the name of the place Massah, and Meribah, because of the `strife` of the sons of Israel, and because of their `trying` Jehovah, saying, `Is Jehovah in our midst or not?`

8 And Amalek cometh, and fighteth with Israel in Rephidim,

9 and Moses saith unto Joshua, `Choose for us men, and go out, fight with Amalek: to-morrow I am standing on the top of the hill, and the rod of God in my hand.`