Isaiah 9

Isaiah's warning to Israel and Judah is the same as it is in out day...if we don't keep the commandments, we will be destroyed".

"For wickedness burneth as the fire: it shall devour the briers and thorns, and shall kindle in the thickets of the forest, and they shall mount up like the lifting up of smoke.
19 Through the wrath of the Lord of hosts is the land darkened, and the people shall be as the fuel of the fire: no man shall spare his brother.
20 And he shall snatch on the right hand, and be hungry; and he shall eat on the left hand, and they shall not be satisfied: they shall eat every man the flesh of his own arm:
21 Manasseh, Ephraim; and Ephraim, Manasseh: and they together shall be against Judah. For all this his anger is not turned away, but his hand is stretched out still."  (Isaiah 9:18–21)

For those that choose to repent -

"The people that walked in darkness have seen a great light: they that dwell in the land of the shadow of death, upon them hath the light shined."  (Isaiah 9:2)

That Light is Christ.