OET interlinear DEU 23:23

uW Translation Notes:

Note 1 topic: figures-of-speech / parallelism

מוֹצָ֥א שְׂפָתֶ֖י⁠ךָ & נְדָבָ֔ה אֲשֶׁ֥ר דִּבַּ֖רְתָּ בְּ⁠פִֽי⁠ךָ

whatever_comes_of (Some words not found in UHB: whatever_comes_of your_two's_lips_of,your diligently and,you_will_do just=as vowed to/for=YHWH God_of,your freely which/who promised with,mouth_of,your )

The phrases What has gone out from your lips and a vow that you have spoken with your mouth mean similar things. Moses is using these expressions together to emphasize the binding nature of spoken vows. If it would be clearer in your language, you could express this with a single phrase at the beginning and leave the second phrase off. Alternate translation: [What you have solemnly promised]

Note 2 topic: figures-of-speech / idiom

מוֹצָ֥א שְׂפָתֶ֖י⁠ךָ

whatever_comes_of (Some words not found in UHB: whatever_comes_of your_two's_lips_of,your diligently and,you_will_do just=as vowed to/for=YHWH God_of,your freely which/who promised with,mouth_of,your )

Moses is using What has gone out from your lips as a common expression of his culture to mean “what you have promised.” If this phrase does not have that meaning in your language, you could use a comparable expression from your language that does have that meaning, or you could state the meaning plainly. Alternate translation: [What you have promised] or [The promise you have made]

Note 3 topic: figures-of-speech / doublet

תִּשְׁמֹ֣ר וְ⁠עָשִׂ֑יתָ

(Some words not found in UHB: whatever_comes_of your_two's_lips_of,your diligently and,you_will_do just=as vowed to/for=YHWH God_of,your freely which/who promised with,mouth_of,your )

The terms keep and do mean similar things. Moses is using the two terms together for emphasis. If it would be clearer for your readers, you could express the emphasis with a single phrase. Alternate translation: [you shall absolutely fulfill]