And he brought him forth abroad, and said to him: Look up to heaven and number the stars, if thou canst. And he said to him: So shall thy seed be.

“Abraham, styled "the friend," [Isaiah 41:8] was found faithful, inasmuch as he rendered obedience to the words of God. He, in the exercise of obedience, went out from his own country, and from his kindred, and from his father's house, in order that, by forsaking a small territory, and a weak family, and an insignificant house, he might inherit the promises of God. For God said to him, "Get you out from your country, and from your kindred, and from your father's house, into the land which I shall show you. And I will make you a great nation, and will bless you, and make your name great, and you shall be blessed. And I will bless them that bless you, and curse them that curse you; and in you shall all the families of the earth be blessed." [Genesis 12:1-3] And again, on his departing from Lot, God said to him, "Lift up your eyes, and look from the place where you now are, northward, and southward, and eastward, and westward; for all the land which you see, to you will I give it, and to your seed forever. And I will make your seed as the dust of the earth, [so that] if a man can number the dust of the earth, then shall your seed also be numbered." [Genesis 13:14-16] And again [the Scripture] says, "God brought forth Abram, and spoke unto him, Look up now to heaven, and count the stars if you are able to number them; so shall your seed be. And Abram believed God, and it was counted to him for righteousness." [Genesis 15:5-6] On account of his faith and hospitality, a son was given him in his old age; and in the exercise of obedience, he offered him as a sacrifice to God on one of the mountains which He showed him. [Genesis 22:9]”

“ויוצא אתו החוצה AND HE BROUGHT HIM FORTH OUTSIDE — Its real meaning is: He brought him outside his tent so that he could look at the stars. Its Midrashic explanation is: Go forth from (give up) your astrological speculations — that you have seen by the planets that you will not raise a son; Abram indeed may have no son but Abraham will have a son: Sarai may not bear a child but Sarah will bear. I will give you other names, and your destiny (מזל planet, luck) will be changed. Another explanation: He brought him forth from the terrestrial sphere, elevating him above the stars, and this is why He uses the term הבט ‘‘look”, when He said “look at the heavens” — for this word signifies looking from above downward (Genesis Rabbah 44:12).”

“AND HE BROUGHT HIM FORTH OUTSIDE. According to the simple interpretation of Scripture it means that He brought him forth from his tent into the open so that he could see the stars. And according to the Midrash its explanation is as follows: G-d said to him, “Leave your astrological speculations, for you have seen by the constellations that you are not destined to raise a son. “Abram” indeed may not have a son, but “Abraham” will have a son; “Sarai” will not bear a child, but “Sarah” will bear a child. Thus the language of Rashi. But ‘Abram’ did have Ishmael! The meaning of the Midrash, however, is that Abram sought a son who would qualify to become his heir, [which excluded Ishmael, who would not inherit him], even as he said, And, lo, my household slave will be mine heir. The Holy One, blessed be He, then said to him, “This man shall not be thine heir, but one born of thine own body shall be thine heir, and leave your astrological speculations. ‘Abram’ will not have a son as his heir, but ‘Abraham’ will have a son as his heir.” It is also possible that the astrological speculation concerned the pair together, namely, the “Abram and Sarai” as a pair will not beget children, and the Eternal now assured him that “Abraham and Sarah” will beget children. In my opinion, however, [the Divine assurance now given to Abraham did not mention Sarah, rather], her name is an addition on the part of the Midrash, meaning that such indeed was the case also with Sarah. The Holy One, blessed be He, however, did not assure him concerning Sarah at the present time. Even at the time of the prophecy concerning the circumcision, Abraham was still in doubt whether “Sarah” would bear a child.”

“And he brought him forth abroad,.... Out of his tent into the open air, which was done through his call, and at his direction; or by an impulse upon his mind; or this might not be real and local, only vision: and said, look now towards heaven; either with his bodily eyes, or with the eyes of his mind: and tell the stars, if thou be able to number them; this looks as if it were in a vision that this was said to him, and what follows done in the day, since it was in the daytime, before the sun was set, Gen 15:12, when the stars could not be seen; and therefore were represented to his mind, and he was directed to consider them in it, whether they could be numbered by him or not: but this might be in the preceding night, or early in the morning, before the sun arose, that Abram was directed to go out of his tent, and view the heavens, and the multitude of stars in them, and try if he could number them; and he might be employed all the day following till sunset, in preparing the creatures for the sacrifice, in cutting them asunder, laying their pieces in order, and watching them, and driving the fowls from them. The multitude of his seed is before signified by the dust of the earth, which cannot be numbered, Gen 13:16, and here by the stars of the sky innumerable; as they are to man, though not to God: some have pretended to number them, as Aratus, Eudoxus, and Hipparchus, among the ancients, and also modern astronomers; but then they are such only that are visible to the eye, and in one hemisphere, and their accounts are very various; whereas there are multitudes to be discerned by glasses, and some not to be distinguished, as in the galaxy, or milky way, and others in the other hemisphere. Now Abram here is bid to try what he could do, and this was in his own way; for he is said by many Heathen writers (h) to be famous for arithmetic and astrology, or astronomy; but as great a master as he was in these sciences, be was not able to number the stars, which is here plainly intimated, since it follows: and he said, so shall thy seed be: as innumerable as the stars, as they were, even his natural seed, Heb 11:12; and especially his spiritual seed, who have the same kind of faith he had, and as they will be in the latter day particularly, Hos 1:10. (h) Apud Euseb. ut supra, (Evangel. Praepar.) l. 9. c. 16, 17. Orpheus apud Clement. Stromat. l. 5. p. 607.”

“Look now toward heaven - It appears that this whole transaction took place in the evening; see on Gen 13:14 (note). Abram had either two visions, that recorded in Gen 15:1, and that in Gen 15:12, etc.; or what is mentioned in the beginning of this chapter is a part of the occurrences which took place after the sacrifice mentioned Gen 15:9, etc.: but it is more likely that there was a vision of that kind already described, and afterwards a second, in which he received the revelation mentioned Gen 15:13-16. After the first vision he is brought forth abroad to see if he can number the stars; and as he finds this impossible, he is assured that as they are to him innumerable, so shall his posterity be; and that all should spring from one who should proceed from his own bowels - one who should be his own legitimate child.”