How O.T. believers were saved

The Old Testament believers’ sins were covered by God’s Grace, through faith, as evidenced by obedience to God in bringing unblemished animal sacrifices whose blood was shed, pointing forward to Jesus, the unblemished Lamb of God, who shed His blood to take away their sins, and our sins, forever.

The following is a helpful excerpt from Dr. J. Vernon McGee’s introduction to The Book of Leviticus: