Isaiah 40:3-5

The voice of him that crieth in the wilderness, Prepare ye the way of the LORD, make straight in the desert a highway for our God. Every valley shall be exalted, and every mountain and hill shall be made low: and the crooked shall be made straight, and the rough places plain: and the glory of the LORD shall be revealed, and all flesh shall see it together: for the mouth of the LORD hath spoken it.

Isaiah 40:3-5