Why did Nadab and Abihu not marry if marriage is a Torah commandment?

This source-based Torah study examines the question: Why did Nadab and Abihu not marry if marriage is a Torah commandment? The canonical Hebrew discussion develops the issue through the weekly Torah portion and the sources cited there, preserving the distinctions, tensions, and practical implications of the original text. This localized discovery layer does not add any new halakhic, medical, legal, scientific, historical, theological, or empirical ruling or claim beyond the canonical Hebrew source.