כי תזריע. לְרַבּוֹת שֶׁאֲפִלּוּ יְלָדַתּוּ מָחוּי — שֶׁנִּמְחָה וְנַעֲשָׂה כְּעֵין זֶרַע
כי תזריע — These words are superfluous, כי ילדה would suffice — they mean literally, ”if she bringeth forth seed”
זרה or זרע
strange or seed
(א) וַיִּקְח֣וּ בְנֵֽי־אַ֠הֲרֹ֠ן נָדָ֨ב וַאֲבִיה֜וּא אִ֣ישׁ מַחְתָּת֗וֹ וַיִּתְּנ֤וּ בָהֵן֙ אֵ֔שׁ וַיָּשִׂ֥ימוּ עָלֶ֖יהָ קְטֹ֑רֶת וַיַּקְרִ֜יבוּ לִפְנֵ֤י יְהֹוָה֙ אֵ֣שׁ זָרָ֔ה אֲשֶׁ֧ר לֹ֦א צִוָּ֖ה אֹתָֽם׃
(1) Now Aaron’s sons Nadab and Abihu each took his fire pan, put fire in it, and laid incense on it; and they offered before יהוה strange fire, which had not been enjoined upon them.
רָשָׁע מָה הוּא אוֹמֵר? מָה הָעֲבוֹדָה הַזּאֹת לָכֶם. לָכֶם – וְלֹא לוֹ. וּלְפִי שֶׁהוֹצִיא אֶת עַצְמוֹ מִן הַכְּלָל כָּפַר בְּעִקָּר. וְאַף אַתָּה הַקְהֵה אֶת שִׁנָּיו וֶאֱמוֹר לוֹ: "בַּעֲבוּר זֶה עָשָׂה ה' לִי בְּצֵאתִי מִמִּצְרָיִם". לִי וְלֹא־לוֹ. אִלּוּ הָיָה שָׁם, לֹא הָיָה נִגְאָל:
What does the evil [son] say? "'What is this worship to you?' (Exodus 12:26)" 'To you' and not 'to him.' And since he excluded himself from the collective, he denied a principle [of the Jewish faith]. And accordingly, you will blunt his teeth and say to him, "'For the sake of this, did the Lord do [this] for me in my going out of Egypt' (Exodus 13:8)." 'For me' and not 'for him.' If he had been there, he would not have been saved.
GEMARA: The Sages taught: If his son is wise and knows how to inquire, his son asks him. And if he is not wise, his wife asks him. And if even his wife is not capable of asking or if he has no wife, he asks himself. And even if two Torah scholars who know the halakhot of Passover are sitting together and there is no one else present to pose the questions, they ask each other.
