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Deuteronomy 23:21
Swete's Septuagint · Berean Standard Bible
Ἐὰν δὲ εὔξῃ εὐχὴν κυρίῳ τῷ θεῷ σου, οὐ χρονιεῖς ἀποδοῦναι αὐτήν, ὅτι ἐκζητῶν ἐκζητήσει Κύριος ὁ θεός σου παρὰ σοῦ, καὶ ἔσται ἐν σοὶ ἁμαρτία·
If you make a vow to the LORD your God, do not be slow to keep it, because He will surely require it of you, and you will be guilty of sin.