(Zechariah continues to prophecy, but now he speaks directly to his newborn son:)

## will be called the prophet ##

This means he actually will be the prophet and people will know him as such. To make that clear, this could be translated as "will be the prophet."

## of the Most High ##

This could be translated as "who serves the Most High" or "who speaks for God Most High."

## how they can be saved through the forgiveness of their sins ##

This can be translated as "how God will save them by forgiving their sins."