Heb 11:24-26, Jn 8:56, Acts 3:25, Gal 3:16, Lk 24:25-27, Lk 24:44
The ancestors of faith in the Old Testament were saved by believing that Christ would come. (Heb 11:1-2, Heb 11:24-26)
Heb 11:1 Now faith is the substance of things hoped for, the evidence of things not seen. 2 For by it the elders obtained a good report.
Heb 11:24 By faith Moses, when he was come to years, refused to be called the son of Pharaoh's daughter; 25 Choosing rather to suffer affliction with the people of God, than to enjoy the pleasures of sin for a season; 26 Esteeming the reproach of Christ greater riches than the treasures in Egypt: for he had respect unto the recompence of the reward.
The offspring of the covenant God promised to Abraham is Christ. (Acts 3:25, Gal 3:16, Jn 8:56)
Acts 3:25 Ye are the children of the prophets, and of the covenant which God made with our fathers, saying unto Abraham, And in thy seed shall all the kindreds of the earth be blessed.
Gal 3:16 Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
Jn 8:56 Your father Abraham rejoiced to see my day: and he saw it, and was glad.
The forefathers of faith in the Old Testament did not know who the coming Christ was. The Christ explained in the Old Testament and prophesied to come is Jesus. (Lk 24:25-27,44)
Lk 24:25 Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken: 26 Ought not Christ to have suffered these things, and to enter into his glory? 27 And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself. 44 And he said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me.