This verse is believed by some to be the key verse of the entire Old Testament. It is an important witness to the doctrine of justification by faith and to the doctrine of the unity in believers in both dispensations. Abraham’s faith was accounted to him for righteousness before he was circumcised and more than 400 years before the law was given to his descendants. Therefore neither circumcision nor the law had any part in Abraham’s righteousness. Paul proves that Abraham’s faith was not merely confidence in God nor simple obedience to God’s command, but that it was indeed faith in the promise of redemption through Christ. (Romans 3:21-22, 4:18-25; Galatians 3:14). The word, “belief” is from the Hebrew root word “Aman.” My favorite translation of this word is as follows; A secure nail that finds a solid place to grip. Like a nail in a cross! Now go to Isaiah 22:23. It reads as follow; And I will fasten him as a nail in a sure place, and he shall be for a glorious throne in his father’s house. The word “sure” is the same Hebrew word “Aman” that is used for the word “belief” in Genesis 15:6. Thankyou. James and Hamsa Sasse. GodWhoisGod.com