Quran 2:224 — The Heifer (Al-Baqarah)

Do not subject GOD's name to your casual swearing, that you may appear righteous, pious, or to attain credibility among the people. GOD is Hearer, Knower.

[2:223] Your women are the bearers of your seed. Thus, you may enjoy this privilege however you like, so long as you maintain righteousness. You shall observe GOD, and know that you will meet Him. Give good news to the believers.

[2:225] GOD does not hold you responsible for the mere utterance of oaths; He holds you responsible for your innermost intentions. GOD is Forgiver, Clement.