מוֹצָ֥א שְׂפָתֶ֖יךָ תִּשְׁמֹ֣ר וְעָשִׂ֑יתָ כַּאֲשֶׁ֨ר נָדַ֜רְתָּ לַיהוָ֤ה אֱלֹהֶ֙יךָ֙ נְדָבָ֔ה אֲשֶׁ֥ר דִּבַּ֖רְתָּ בְּפִֽיךָ׃ (ס)
Mais la parole sortie de tes lèvres, tu dois l’exécuter religieusement, une fois que tu auras voué à l’Éternel, ton Dieu, une offrande volontaire, promise par ta propre bouche.
Rav Hirsch
מוצא פי ה׳ (vergl. Jes. 55, 11). כן יהיה דברי אשר יצא מפי, wo damit jede von Gott ausgehende Bestimmung bezeichnet wird. So heißt auch beim Menschen das Wort, das, sei es als Gelübde, oder als Wunsch, Tat werden soll: מוצא שפתיו. Dewarim 23, 24 und Jirmija 17, 16). So auch von Gott die über die Davidische Dynastie ausgesprochene Bestimmung: ומוצא שפתי לא אשנה (Ps. 89, 35).
Bartenura
נדבה – He who says, “behold this burnt offering is upon me,” and it was lost, he is not liable for his property which may resorted to in the event of non-payment, for he did not accept it upon himself, but [regarding] the matter of "בל תאחר"/that he should not be late (see Deuteronomy 23:22: “When you make a vow to the LORD your God, do not put off fulling it/לא תאחר לשלמו , [for the LORD your God will require it of you, and you will have incurred guilt.]”); both are equivalent, as it says (Deuteronomy 23:24): “…and perform what you have voluntarily vowed to the LORD your God, having made the promise with your own mouth,” for behold, vows and donations are mentioned in this matter.
Bartenura
עד שיהיו פיו ולבו שוין – as it is written (Deuteronomy 23:24): “You must fulfill what has crossed your lips [and perform what you have voluntarily vowed to the LORD your God, having made the promise with your own mouth],” and it is written (Exodus 35:22 – the printed text listed Chapter 34, an error): [“Men and women] whose hearts moved them, [all who would gladly make an elevation of gold to the LORD],” How now? We require that he resolved in his heart and enunciating [the same thought] with his lips.