For you will go on before the Lord to prepare the way for him, to give his people the knowledge of salvation

Luke 1:57-80

Then they made signs to his father, to find out what he would like to name the child. He asked for a writing tablet, and to everyone’s astonishment he wrote, “His name is John.” Immediately his mouth was opened and his tongue set free, and he began to speak, praising God. All the neighbors were filled with awe, and throughout the hill country of Judea people were talking about all these things. Everyone who heard this wondered about it, asking, “What then is this child going to be?” For the Lord’s hand was with him.

His father Zechariah was filled with the Holy Spirit and prophesied: “Praise be to the Lord, the God of Israel, because he has come to his people and redeemed them. He has raised up a horn[c] of salvation for us in the house of his servant David.

And you, my child, will be called a prophet of the Most High;  for you will go on before the Lord to prepare the way for him, to give his people the knowledge of salvation through the forgiveness of their sins, because of the tender mercy of our God, by which the rising sun will come to us from heaven to shine on those living in darkness and in the shadow of death, to guide our feet into the path of peace.”

Why?
After the father of John wrote his name, his tongue was set free and he began to speak. this is a sign of the work of the Lord.

Zechariah was filled with the Holy Spirit and prophesied the word of his son. John will walk before the Lord to prepare the way for Jesus.

All the story of Jaon and Jesus coming is the way of the Lord preparing for Isrelites.

How?

Luke explains the coming of Jesus and John. So it declared that Jesus and John come in the way of the Lord.