Deuteronomio 23

Pero asegúrate de cumplir lo que le has dicho al Señor tu Dios, porque fuiste tú quien eligió libremente hacer tal promesa.

Guardarás lo que tus labios pronunciaren; y harás, como prometiste á Jehová tu Dios, lo que de tu voluntad hablaste por tu boca.

That which is gone out of thy lips thou shalt keep and perform; even a freewill offering, according as thou hast vowed unto the LORD thy God, which thou hast promised with thy mouth.

You shall observe and do that which has gone out of your lips. Whatever you have vowed to the LORD your God as a free will offering, which you have promised with your mouth, you must do.