Parashas Bamidbar
וְאֵ֛לֶּה תּוֹלְדֹ֥ת אַהֲרֹ֖ן וּמֹשֶׁ֑ה בְּי֗וֹם דִּבֶּ֧ר יְהֹוָ֛ה אֶת־מֹשֶׁ֖ה בְּהַ֥ר סִינָֽי׃
This is the line of Aaron and Moses at the time that GOD spoke with Moses on Mount Sinai.
Torah Temimah points to R’ Shmuel bar Nachmani in the name of R’ Yonasan — Sanhedrin 19b (verified).
ואלה תולדת אהרן ומשה — א״ר שמואל בר נחמני א״ר יונתן: כל המלמד את בן חבירו תורה מעלה עליו הכתוב כאלו ילדו.
English: “And these are the generations of Aharon and Moshe” — R’ Shmuel bar Nachmani said in the name of R’ Yonasan: Whoever teaches the son of his fellow Torah, Scripture regards him as if he had begotten him.
Custom
Chazal teach that one who teaches another’s child Torah is credited as if he had given birth to him.