The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
Exodus Chapter 17
rock
The rock, type of life through the Spirit by grace:
(1) Christ the Rock (Co1 10:4).
(2) The people utterly unworthy (Exo 17:2); (Eph 2:1-6).
(3) Characteristics of life through grace: