Isaiah 40:3-4 New King James Version (NKJV)

3 The voice of one crying in the wilderness:
“Prepare the way of the Lord;
Make straight [a]in the desert
A highway for our God.
4 Every valley shall be exalted
And every mountain and hill brought low;
The crooked places shall be made straight
And the rough places smooth; our God.

John the baptist was the one sent to prepare the way of the Lord Jesus Christ, prophesied by the prophet Isaiah


John 1:22-23


22 Then they said to him, “Who are you, that we may give an answer to those who sent us? What do you say about yourself?”

23 He said: “I am
[b]
‘The voice of one crying in the wilderness:
“Make straight the way of the Lord,” ’
as the prophet Isaiah said.”

Jesus is God