Source and decoding — Yevamot 6a
דְּתַנְיָא, יָכוֹל אָמַר לוֹ אָבִיו: הִיטַּמֵּא, אוֹ שֶׁאָמַר לוֹ: אַל תַּחְזִיר, יָכוֹל יִשְׁמַע לוֹ? תַּלְמוּד לוֹמַר: ״אִישׁ אִמּוֹ וְאָבִיו תִּירָאוּ וְאֶת שַׁבְּתוֹתַי תִּשְׁמוֹרוּ״, כּוּלְּכֶם חַיָּיבִין בִּכְבוֹדִי.
The baraita asks whether to obey a father who requests ritual defilement or non-return of lost property. The verse teaches that parent and child alike owe honor to God.
“Could it be” introduces a possibility, not a conclusion; “the verse teaches” limits it. The continuation rejects the analogy because of “preparation for a mitzvah”: preparation need not be performance of the command itself. This does not imply that every positive command overrides every prohibition.