Isaiah 48:4

4 Because I knew that thou art obstinate,[a] and thy neck is an iron sinew, and thy brow brass;

Isaiah 48:4 In-Context

2 For they call themselves of the holy city, and stay themselves upon the God of Israel; The LORD of hosts is his name.
3 I have declared the former things from the beginning; and they went forth out of my mouth, and I shewed them; I did them suddenly, and they came to pass.
4 Because I knew that thou art obstinate, and thy neck is an iron sinew, and thy brow brass;
5 I have even from the beginning declared it to thee; before it came to pass I shewed it thee: lest thou shouldest say, Mine idol hath done them, and my graven image, and my molten image, hath commanded them.
6 Thou hast heard, see all this; and will not ye declare it? I have shewed thee new things from this time, even hidden things, and thou didst not know them.

Footnotes 1

The King James Version is in the public domain.