Responsa for Exodus 20:7
לֹ֥א תִשָּׂ֛א אֶת־שֵֽׁם־יְהוָ֥ה אֱלֹהֶ֖יךָ לַשָּׁ֑וְא כִּ֣י לֹ֤א יְנַקֶּה֙ יְהוָ֔ה אֵ֛ת אֲשֶׁר־יִשָּׂ֥א אֶת־שְׁמ֖וֹ לַשָּֽׁוְא׃ (פ)
Thou shalt not take the name of the LORD thy God in vain; for the LORD will not hold him guiltless that taketh His name in vain.
Teshuvot HaRosh
As to his desire to marry a second wife in order to procreate: He should not violate an oath, which is so severe that the entire world shook at the statement “[the Lord will not] leave him unpunished” (Shemot 20:7; Shevu’ot 39a), for the sake of the mitzva of procreation. Had she given him money like he wanted, he would not have been concerned about the mitzva of procreation. Therefore, I do not think his oath should be released at all.
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