בְּטֶ֨רֶם אצורך [אֶצָּרְךָ֤] בַבֶּ֙טֶן֙ יְדַעְתִּ֔יךָ וּבְטֶ֛רֶם תֵּצֵ֥א מֵרֶ֖חֶם הִקְדַּשְׁתִּ֑יךָ נָבִ֥יא לַגּוֹיִ֖ם נְתַתִּֽיךָ׃
Antes que te formase en el vientre te conocí, y antes que salieses de la matriz te santifiqué, te dí por profeta á las gentes.
Rashi on Jeremiah
When I had not yet formed you in the womb, etc. Since the days of the first man. The Holy One, blessed be He, showed Adam each generation and its prophets.
Rashi on Jeremiah
I...formed you Heb. אצרך, an expression of צורה, a form.
Rashi on Jeremiah
I knew you connois toi in O.F. Comp. (Exodus 6:3), “I was not known (נודעתּי) to them.”