If a man vows a vow to the Lord, or swears an oath to bind himself by a pledge, he shall not break his word. He shall do according to all that proceeds out of his mouth.
But do not be persuaded by them, for more than forty of their men are lying in ambush for him, who have bound themselves by an oath neither to eat nor drink till they have killed him. And now they are ready, waiting for your consent.”
Behold, upon the mountains, the feet of him who brings good news, who publishes peace! Keep your feasts, O Judah; fulfill your vows, for never again shall the worthless pass through you; he is utterly cut off.
or if anyone utters with his lips a rash oath to do evil or to do good, any sort of rash oath that people swear, and it is hidden from him, when he comes to know it, and he realizes his guilt in any of these;
“Woe to you, blind guides, who say, ‘If anyone swears by the temple, it is nothing, but if anyone swears by the gold of the temple, he is bound by his oath.’
And at the end of two months, she returned to her father, who did with her according to his vow that he had made. She had never known a man, and it became a custom in Israel
So Jephthah went with the elders of Gilead, and the people made him head and leader over them. And Jephthah spoke all his words before the Lord at Mizpah.