Al-Hasan (may Allah have mercy on him) reports from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "Whoever swears by a surah of the Qur'an, then for every verse there is (the expiation of) a binding oath; whoever wishes may keep true (to it), and whoever wishes may break it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأيمان / 19899