Genesis 15:4

“And behold, the word of the Lord [came] unto him, etc.] Either having disappeared, and then came a second time, or he again spoke unto him: saying, this shall not be thine heir; this Eliezer, this servant of thine, as thou hast made him, or hast intended to make him, giving up all hopes of having issue by Sarai: but he that shall come forth out of thine own bowels shall be thine heir; that is, one shall inherit all thou hast, that shall be begotten by thee; an own son of Abram’s, and not a servant born in his house; one that should spring out of his own loins: the Vulgate Latin version renders it, “out of thy womb”, that is, out of his wife’s, which was his; the phrase designs a genuine and…”

“This shall not be thine heir--To the first part of his address no reply was given; but having renewed it in a spirit of more becoming submission, "whereby shall I know that I shall inherit it" [Gen 15:8], he was delighted by a most explicit promise of Canaan, which was immediately confirmed by a remarkable ceremony.”

“- 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…”

“15:4-6 God affirmed that the promise was for Abram’s own offspring and showed him the stars as a promise of the vast number of descendants that he would have (22:17; 26:4). Paul quotes this promise in Rom 4:18 to underscore the strength of Abram’s faith.”