Numbers 30:2

2 When 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.

Numbers 30:2 In-Context

1 Moses said to the heads of the tribes of the people of Israel, "This is what the LORD has commanded.
2 When 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.
3 Or when a woman vows a vow to the LORD, and binds herself by a pledge, while within her father's house, in her youth,
4 and her father hears of her vow and of her pledge by which she has bound herself, and says nothing to her; then all her vows shall stand, and every pledge by which she has bound herself shall stand.
5 But if her father expresses disapproval to her on the day that he hears of it, no vow of hers, no pledge by which she has bound herself, shall stand; and the LORD will forgive her, because her father opposed her.
Revised Standard Version of the Bible, copyright 1952 [2nd edition, 1971] by the Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.