Genesis 15:6

“And he believed in the Lord, etc.] The Targums of Onkelos and Jonathan are, “in the Word of the Lord;” in the essential Word of the Lord, in Christ the Lord his righteousness; he believed in the promise of God, that he should have a seed, and a very numerous one; he believed that the Messiah would spring from his seed; he believed in him as his Saviour and Redeemer; he believed in him for righteousness, and he believed in his righteousness as justifying him before God: and he counted it to him for righteousness; not the act of his faith, but the object of it; and not the promise he believed, but what was promised, and his faith received, even Christ and his righteousness this was imputed to…”

“- The Faith of Abram 1. דבר dābār, “a word, a thing;” the word being the sign of the thing. 2. אדני 'ǎdonāy, “Adonai, the Lord;” related: “bring down, lay down.” This is the name usually read in place of Yahweh; but when, as in the present case, יהוה yehovâh and אדני 'ǎdonāy are in apposition, אלהים 'ĕlohı̂ym is read instead of the former. The Jews from a feeling of reverence avoided the utterance of this sacred name except on the most solemn occasions. This is said to have arisen from a stringent interpretation of Leviticus 24:16. According to some, this name was pronounced only once a year by the high priest, on the day of atonement, in the Holy of Holies, and according to others…”

“15:6 And Abram believed: God made his covenant with a believer; the statement does not indicate when Abram came to faith. The Hebrew text does not link Abram’s belief with the promise of the stars; it just says parenthetically that Abram believed God. Abram already had faith; his departure from Ur was his first great act that demonstrated it (see Heb 11:8-10). • God counted him as righteous because of his faith: This central statement about Abram’s saving faith is quoted three times in the New Testament (Rom 4:3; Gal 3:6; Jas 2:23) to support the doctrine of righteousness before God by faith (see also Rom 4:22-23).”