22:2 my rock. These two words for “rock” (Hebrew cela and tsur, respectively) are the same as for the two rocks smitten by Moses (Exodus 17:6; Numbers 20:11), except that the order is reversed.
22:3 in him will I trust. David’s statement of faith—“in Him will I trust”—is inserted in the midst of this unique string of nine expressive metaphors applied to God by David. However, it is quoted in Hebrews 2:13 as coming from the lips of Christ in His human incarnation. The same is true of II Samuel 22:50, as quoted in Romans 15:9. These statements, taken from the beginning and concluding sections of David’s song of testimony, clearly tell us that its context goes far beyond David’s own personal experiences, though it applies there also. It is one of the “Messianic psalms,” both rehearsing the past actions and predicting the future experiences of God Himself, especially in His great works of redemption and judgment.
22:3 my saviour. This is the last of the nine great ascriptions to God. The word “Saviour” is yasha in the Hebrew, very close to the name “Jesus.” An Israelite might easily have read this climaxing assertion as “Jehovah is...my Jesus, [who] savest me from violence.”