Necessary Faith
Both in the OT and the NT faiith is the only basis of salvation. Faith is the means by which God's rrace and with with him the blessings of salvation is received. Paul's doctrine of justification by faith emphasises the centrality of faith in the Christian life
Salvation by Faith-The Old Testament
The conclusion is that God has ever had but one Church in the world. The Jehovah of the Old Testament is our Lord; the God of Abraham, Isaac, and Jacob, is our covenant God and Father; our Saviour was the Saviour of the saints who lived before his advent in the flesh. The divine person who delivered the Israelites out of Egypt; who led them through the wilderness; who appeared in his glory to Isaiah in the temple; towards whose coming the eyes of the people of God were turned in faith and hope from the beginning, is He whom we recognize as God manifest in the flesh, our Lord and Saviour Jesus Christ. He, therefore, who was the head of the theocracy is the head of the Church. The blood which He shed for us, was shed from the foundation of the world, as much “for the redemption of the transgressions which were under the first testament” (Heb. 9:15), as for us and for our salvation. The promise unto which the twelve tribes, instantly serving God day and night, hoped to come (Acts 26:7), is the promise on which we rely. The faith which saved Abraham was, both as to its nature and as to its object, that which is the condition of salvation under the Gospel. “The city which hath foundations, whose builder and maker is God” (Heb. 11:10), is “Jerusalem the golden,” the heaven to which we aspire.
15:6 Abram believed20 the LORD, and the LORD21 considered his response of faith22 as proof of genuine loyalty.23