1 Corinthians 10:4 and drank the same spiritual drink; for they drank from the spiritual rock that accompanied them, and that rock was Christ.
2 Samuel 23:3 The God of Israel spoke, the Rock of Israel said to me: 'When one rules over people in righteousness, when he rules in the fear of God,
Psalms 89:26 He will call out to me, 'You are my Father, my God, the Rock my Savior.
And notice that in the OT verses where "Rock" refers to "God" that the "R" is capitalized, but that in Isaiah 51:1-2 "rock" is not capitalized, because there it's referring to Abraham and not God? Get it?