Genesis 15:5

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).

וַיּוֹצֵ֨א אֹת֜וֹ הַח֗וּצָה וַיֹּ֙אמֶר֙ הַבֶּט־נָ֣א הַשָּׁמַ֗יְמָה וּסְפֹר֙ הַכּ֣וֹכָבִ֔ים אִם־תּוּכַ֖ל לִסְפֹּ֣ר אֹתָ֑ם וַיֹּ֣אמֶר ל֔וֹ כֹּ֥ה יִהְיֶ֖ה זַרְעֶֽךָ׃

And He brought him outside, and said, Look now toward heaven, and count the stars, if thou be able to number them: and He said to him, So shall thy seed be.