Esias 48:4

4 I know that thou art stubborn, and thy neck is an iron sinew, and thy forehead brazen.

Esias 48:4 In-Context

2 maintaining also the name of the holy city, and staying themselves on the God of Israel: the Lord of hosts is his name. The former things I have already declared;
3 and they that have proceeded out of my mouth, and it became well known; I wrought suddenly, and came to pass.
4 I know that thou art stubborn, and thy neck is an iron sinew, and thy forehead brazen.
5 And I told thee of old what before it came upon thee; I made it known to thee, lest thou shouldest say, idols have done for me; and shouldest say, graven and molten images have commanded me.
6 Ye have heard all this, but ye have not known: yet I have made known to thee the new things from henceforth, which are coming to pass, and thou saidst not,

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