Commentaries:
Jamieson, Fausset, and Brown
Before Abraham was, I am—The words rendered "was" and "am" are quite different. The one clause means, "Abraham was brought into being"; the other, "I exist." The statement therefore is not that Christ came into existence before Abraham did (as Arians affirm is the meaning), but that He never came into being at all, but existed before Abraham had a being; in other words, existed before creation, or eternally (as John 1:1). In that sense the Jews plainly understood Him, since "then took they up stones to cast at Him," just as they had before done when they saw that He made Himself equal with God (John 5:18).
hid himself—(See on Luke 4:30).
Then said the Jews unto him, Thou art not yet fifty years old—"No inference can be drawn from this as to the age of our Lord at the time as man. Fifty years was with the Jews the completion of manhood" [ALFORD].
and hast thou seen Abraham?—He had said Abraham saw Him, as being his peculiar privilege. They give the opposite turn to it—"Hast Thou seen Abraham?" as an honor too great for Him to pretend to.
Other Jamieson, Fausset, and Brown entries containing John 8:58:
Mark 6:50
John 10:25-26
John 10:31
Colossians 1:17
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