Leviticus 5:4 in the King James Version
Or if a soul swear, pronouncing with his lips to do evil, or to do good, whatsoever it be that a man shall pronounce with an oath, and it be hid from him; when he knoweth of it, then he shall be guilty in one of these.
Context
3 “‘Or if he touches the uncleanness of man, whatever his uncleanness is with which he is unclean, and it is hidden from him; when he knows of it, then he shall be guilty.
4 “‘Or if anyone swears rashly with his lips to do evil or to do good—whatever it is that a man might utter rashly with an oath, and it is hidden from him—when he knows of it, then he will be guilty of one of these.
5 It shall be, when he is guilty of one of these, he shall confess that in which he has sinned;