Abraham
Then he believed in the LORD; and He reckoned it to him as righteousness.
Genesis 15:6
Abraham believed, and God called it righteousness in him. This is the basis of our justification in the cross of Christ, for it is by faith that we have access to this Grace called Calvary (Romans 5:2). Without faith, it is impossible to please God (Hebrews 11:6), for one must first believe that God is, and that He rewards those that diligently pursue Him.
This is the picture of faith. When Abraham, then Abram, heard God speak, and God showed Him the stars in the sky and that his descendants would be like unto them in number (Genesis 15:6), he took God at His word. Later, when Abraham was told to sacrifice his one and only true heir, Abraham believed that God could raise him back from the dead (Hebrews 11:19). Faith saw the promise of God’s word, and grabbed a hold.