3 This is he who was spoken of through the prophet Isaiah: “A voice of one calling in the wilderness, ‘Prepare the way for the Lord, make straight paths for him.’ ”a

Read Matthew 3:3 Using Other Translations

For this is he that was spoken of by the prophet Esaias, saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight.
For this is he who was spoken of by the prophet Isaiah when he said, "The voice of one crying in the wilderness: 'Prepare the way of the Lord; make his paths straight.'"
The prophet Isaiah was speaking about John when he said, “He is a voice shouting in the wilderness, ‘Prepare the way for the LORD ’s coming! Clear the road for him!’”