Esias 51:12

12 I, I, am he that comforts thee: consider who thou art, that thou wast afraid of mortal man, and of the son of man, who are withered as grass.

Esias 51:12 In-Context

10 Art thou not it that dried the sea, the water, the abundance of the deep; that made the depths of the sea a way of passage for the delivered and redeemed?
11 for by the Lord they shall return, and come to Sion with joy and everlasting exultation, for praise and joy shall come upon their head: pain, and grief, and groaning, have fled away.
12 I, I, am he that comforts thee: consider who thou art, that thou wast afraid of mortal man, and of the son of man, who are withered as grass.
13 And thou hast forgotten God who made thee, who made the sky and founded the earth; and thou wert continually afraid because of the wrath of him that afflicted thee: for he counselled to take thee away, yet now where is the wrath of him that afflicted thee?
14 For in thy deliverance he shall not halt, nor tarry;

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