וַיֹּ֤אמֶר יְהוָה֙ אֶל־אַבְרָ֔ם לֶךְ־לְךָ֛ מֵאַרְצְךָ֥ וּמִמּֽוֹלַדְתְּךָ֖ וּמִבֵּ֣ית אָבִ֑יךָ אֶל־הָאָ֖רֶץ אֲשֶׁ֥ר אַרְאֶֽךָּ׃
I rzekł Wiekuisty do Abrama: Wyjdź z ziemi twojej, i z ojczyzny twojej, i z domu ojca twojego, do ziemi, którą ci wskażę.
Midbar Kedemot
10) Our father Abraham, peace be upon him: The Holy One, blessed be He, compared him to rain. Accordingly, the words Abram, "Surely go" [Avram, "Lekh lekhah"] (Genesis 12:1) is the numerical equivalent [gematria] of rain [geshem]. Just like rain is enclosed in the clouds, and no one knows its nature, but when it falls to the earth, everyone benefits from it; so too [Abraham's] nature did not go out into the world when he was in his [previous] place. And just like rain brings blessing to the world, so too you — and you shall be a blessing (Genesis 12:2). And Rabbenu Ephraim also wrote at length [about this] in his commentary. And it is possible even to say that Avraham is the numerical equivalent of precipitation [matar] when being inclusive [adding the word itself to the count, a tool used when the equivalent is off by one].