Isiah, long before Christ appeared, unfolds the Gospel plan
Isiah 1:18
18 “Come, let us discuss this,”
says the Lord.
“Though your sins are like scarlet,
they will be as white as snow;
though they are as red as crimson,
they will be like wool.
19 If you are willing and obedient,
you will eat the good things of the land.
See pg 12 in They Walked with God. Full Assurance by Henry A Ironside.