Deuteronomy 23:22-24

New Revised Standard Version, Anglicised Catholic Edition

²² But if you refrain from vowing, you will not incur guilt. ²³ Whatever your lips utter you must diligently perform, just as you have freely vowed to the Lord your God with your own mouth.

²⁴ If you go into your neighbour’s vineyard, you may eat your fill of grapes, as many as you wish, but you shall not put any in a container.