اَلْعَدَد 30:2

إِذَا نَذَرَ رَجُلٌ نَذْرًا لِلرَّبِّ، أَوْ أَقْسَمَ قَسَمًا أَنْ يُلْزِمَ نَفْسَهُ بِلَازِمٍ، فَلَا يَنْقُضْ كَلَامَهُ. حَسَبَ كُلِّ مَا خَرَجَ مِنْ فَمِهِ يَفْعَلُ.

If a man vow a vow unto the LORD, or swear an oath to bind his soul with a bond; he shall not break his word, he shall do according to all that proceedeth out of his mouth.