Genesis 15:9

“And he said unto him, take me an heifer of three years old, etc.] This, with what follows, is the sign by which Abram might know that he, that is, his seed, should inherit the land of Canaan; for the whole of this is an emblem of the state and condition of his posterity, until they should enter into that land: wherefore he is ordered to “take” out of his herds and flocks this and the following creatures, which were used in sacrifice before the ceremonial law was given, as well as under it; and the distinction of creatures for sacrifice, though not for food, was known as early, as appears from (<010820>Genesis 8:20); hence Onkelos renders the phrase, “offer before me”; and the Targum of…”

“Take me an heifer, &c.--On occasions of great importance, when two or more parties join in a compact, they either observe precisely the same rites as Abram did, or, where they do not, they invoke the lamp as their witness. According to these ideas, which have been from time immemorial engraven on the minds of Eastern people, the Lord Himself condescended to enter into covenant with Abram. The patriarch did not pass between the sacrifice and the reason was that in this transaction he was bound to nothing. He asked a sign, and God was pleased to give him a sign, by which, according to Eastern ideas, He bound Himself. In like manner God has entered into covenant with us; and in the glory of the…”

“- 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…”