The Gospel in Isaiah 50:10-11

v. 10
Who among you fears the Lord?
Who obeys the voice of His Servant?
Who walks in darkness and has no light?
Let him trust in the name of the Lord and rely upon his God.

v. 11
Look, all you who kindle a fire
Who encircle yourselves with sparks;
Walk in the light of your fire and in the sparks you have kindled -
This you shall have from My hand:
You shall lie down in torment.

Could Isaiah be any clearer about the Lord's offer of salvation and the consequences of rejecting it? Salvation is like a light for those walking in utter darkness. It comes by trusting the Lord and His Servant - the promised Son of God (Gen 3:16).

Rejecting the Servant of God results in a different sort of light - the light of fire. Notice where responsibility for the firey torment lies. The sinner kindles the fire! Rejecting the God's Servant results in the kindling of an eternally raging fire. All who reject God's Son will have eternal punnishment, torment, from the hand of the Lord.

Those are the options. The Gospel is clear in the Old Testament. Seek the Son. Trust the Son. Obey the Son. Live forever in the light of God's salvation . . . or else.