Esias 40:5

5 And the glory of the Lord shall appear, and all flesh shall see the salvation of God: for the Lord has spoken .

Esias 40:5 In-Context

3 The voice of one crying in the wilderness, Prepare ye the way of the Lord, make straight the paths of our God.
4 Every valley shall be filled, and every mountain and hill shall be brought low: and all the crooked shall become straight, and the rough plains.
5 And the glory of the Lord shall appear, and all flesh shall see the salvation of God: for the Lord has spoken .
6 The voice of one saying, Cry; and I said, What shall I cry? All flesh is grass, and all the glory of man as the flower of grass:

The Brenton translation of the Septuagint is in the public domain.