Genesis 15:6 – “And he believed the Lord, and he counted it to him as righteousness.”
“Since the verb to ‘believe’ in Genesis 15:6 is the Hebrew hiphil form of the verb ‘aman (cf. English ‘amen’), Geerhardus vos pointed to the ‘causative-productive sense’ of the verb and to the preposition. Both, in his judgment, showed that faith had its source and its object in the personal Yahweh. For Abraham, it meant he had to renounce all his human efforts to secure the promise and depend on the same divine person who spoke of the future to work in the present and the future to accomplish what He said He would do. Thus Abraham possessed the promises of God as yet unrealized when he possessed the God of the promises and His trustworthy word.“
Found in Walter C. Kaiser Jr., Toward an Old Testament Theology (Grand Rapids: Zondervan, 1978), 92.