exodus 17:1 And all the congregation of the children of Israel journeyed from the wilderness of Sin, after their journeys, according to the commandment of the LORD, and pitched in Rephidim: and there was no water for the people to drink. - Free Bible Online

      Ex 17:1-7. THE PEOPLE MURMUR FOR WATER.

      1. the children of Israel journeyed from the wilderness of Sin--In the succinct annals of this book, those places only are selected for particular notice by the inspired historian, which were scenes memorable for their happy or painful interest in the history of the Israelites. A more detailed itinerary is given in the later books of Moses, and we find that here two stations are omitted (Nu 33:1-56).
      according to the commandment of the Lord, &c.--not given in oracular response, nor a vision of the night, but indicated by the movement of the cloudy pillar. The same phraseology occurs elsewhere (Nu 9:18, 19).
      pitched in Rephidim--now believed, on good grounds, to be Wady Feiran, which is exactly a day's march from Mount Sinai, and at the entrance of the Horeb district. It is a long circuitous defile about forty feet in breadth, with perpendicular granite rocks on both sides. The wilderness of Sin through which they approached to this valley is very barren, has an extremely dry and thirsty aspect, little or no water, scarcely even a dwarfish shrub to be seen, and the only shelter to the panting pilgrims is under the shadow of the great overhanging cliffs.

JFB.