Numbers 30:2 When a man vows a vow to Yahweh, or swears an oath to bind his soul with a bond, he shall not break his word; he shall do according to all that proceeds out of his mouth. (See NIV)
Nehemiah 10:35 and to bring the first fruits of our ground, and the first fruits of all fruit of all manner of trees, year by year, to the house of Yahweh; (See RSV)