Zacharias here foretells what came to pass about thirty years after, for it cannot be thought that John began his ministry before the sacerdotal age, especially considering Christ did not begin sooner, Luke 3:23. Thou shalt be called the prophet; that may either signify, thou shalt be a prophet, as Matthew 5:9 1 Thessalonians 1:12; or thou shalt be owned or taken notice of as the prophet of the Highest. Both were true in John. He was a prophet, (though not that Prophet, 1 Thessalonians 1:21), yea, and more than a prophet, saith our Saviour, Matthew 11:9. For thou shalt go before his face to prepare his ways. This was according to the prophecy, Isaiah 40:3 Zechariah 4:5: and according to what John said of himself, Matthew 3:3 Mark 1:3. See Poole on "Matthew 3:3".
Related Commentaries of Luke 1:76
Luke 1:76
76 And thou, child, shalt be called the prophet of the Highest: for thou shalt go before the face of the Lord to prepare his ways;