Isaiah 40:3-5

3A voice of one crying out: Prepare the way of the Lord in the wilderness; make a straight highway for our God in the desert.

4Every valley will be lifted up, and every mountain and hill will be leveled; the uneven ground will become smooth and the rough places, a plain.

5And the glory of the Lord will appear, and all humanity together will see it, for the mouth of the Lord has spoken.