Targum for Numbers 30:3
אִישׁ֩ כִּֽי־יִדֹּ֨ר נֶ֜דֶר לַֽיהוָ֗ה אֽוֹ־הִשָּׁ֤בַע שְׁבֻעָה֙ לֶאְסֹ֤ר אִסָּר֙ עַל־נַפְשׁ֔וֹ לֹ֥א יַחֵ֖ל דְּבָר֑וֹ כְּכָל־הַיֹּצֵ֥א מִפִּ֖יו יַעֲשֶֽׂה׃
When a man voweth a vow unto the LORD, or sweareth 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.
Targum Jonathan on Numbers
A man, a son of thirteen when he shall have vowed a vow before the Lord, or have sworn an oath, saying, I will withhold from such a thing which is permitted to me, shall not be allowed to relax his word (at his own will): nevertheless, the house of judgment (beth dina) can absolve him; but if they absolve him not, whatsoever hath gone out of his mouth he shall perform.
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