Original Verse:
Numbers Chapter 30 Verse 6And if she be [married] to a husband, while her vows are upon her, or the rash utterance of her lips, wherewith she hath bound her soul,

Reference Verses:
Leviticus Chapter 5 Verse 4Or if any one swear rashly with his lips to do evil, or to do good, whatsoever it be that a man shall utter rashly with an oath, and it be hid from him; when he knoweth of it, then he shall be guilty in one of these [things].