Fulfill what you uttered and do what you vowed

"You shall be careful to perform what goes out from your lips, just as you have voluntarily vowed to the LORD your God, what you have promised.

Hebrew

כד מוֹצָא שְׂפָתֶיךָ, תִּשְׁמֹר וְעָשִׂיתָ: כַּאֲשֶׁר נָדַרְתָּ לַיהוָה אֱלֹהֶיךָ, נְדָבָה, אֲשֶׁר דִּבַּרְתָּ, בְּפִיךָ. {ס}

Greek

(23:24) τὰ ἐκπορευόμενα διὰ τῶν χειλέων σου φυλάξῃ καὶ ποιήσεις ὃν τρόπον εὔξω κυρίῳ τῷ θεῷ σου δόμα, ὃ ἐλάλησας τῷ στόματί σου.

• Parashah: Ki Tetze
• Mishneh Torah: Promises — Vows

• Deuteronomy 23:23

Enumeration and classification from BibleData. The Greek is the Septuagint reading of the same verse, carried by the source for comparison.