וְאֶֽעֶשְׂךָ֙ לְג֣וֹי גָּד֔וֹל וַאֲבָ֣רֶכְךָ֔ וַאֲגַדְּלָ֖ה שְׁמֶ֑ךָ וֶהְיֵ֖ה בְּרָכָֽה׃
내가 너로 큰 민족을 이루고 네게 복을 주어 네 이름을 창대케 하리니 너는 복의 근원이 될지라
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].