Parashas Bamidbar
וַיָּ֣מׇת נָדָ֣ב וַאֲבִיה֣וּא לִפְנֵ֣י יְהֹוָ֡ה בְּֽהַקְרִבָם֩ אֵ֨שׁ זָרָ֜ה לִפְנֵ֤י יְהֹוָה֙ בְּמִדְבַּ֣ר סִינַ֔י וּבָנִ֖ים לֹא־הָי֣וּ לָהֶ֑ם וַיְכַהֵ֤ן אֶלְעָזָר֙ וְאִ֣יתָמָ֔ר עַל־פְּנֵ֖י אַהֲרֹ֥ן אֲבִיהֶֽם׃ {פ}
But Nadab and Abihu died by GOD’s will,aby GOD’s will Lit. “before GOD.” when they offered alien fire before GOD in the wilderness of Sinai; and they left no sons. So it was Eleazar and Ithamar who served as priests in the lifetime of their father Aaron.
Torah Temimah points to TT (second unit) (verified).
ובנים לא היו להם —\ldots חייב מיתה שנאמר וימת נדב ואביהוא ובנים לא היו להם.
English: “And they had no children” — \ldots liable to death, as it is said “and Nadav and Avihu died, and they had no children.”
Custom
Chazal use the verse as a proof-text regarding the obligation of procreation.