OET interlinear 1 KI 8:42

uW Translation Notes:

Note 1 topic: grammar-connect-words-phrases

כִּ֤י

(Some words not found in UHB: that/for/because/then/when people,will_hear DOM name_of,your (the),great and=DOM hand_of,your (the),mighty and,arm_of,your (the),outstretched and,he_will_come and,he_will_pray to/towards the,house (the),this )

Here the word for introduces not a reason but an explanation. Alternate translation: [After all,]

Note 2 topic: writing-pronouns

יִשְׁמְעוּ⁠ן֙ & וּ⁠בָ֥א

(Some words not found in UHB: that/for/because/then/when people,will_hear DOM name_of,your (the),great and=DOM hand_of,your (the),mighty and,arm_of,your (the),outstretched and,he_will_come and,he_will_pray to/towards the,house (the),this )

The pronoun they refers to foreigners in general, while the pronoun he refers to an individual foreigner. It may be helpful to clarify this for your readers. Alternate translation: [foreigners will hear & and an individual foreigner will come]

Note 3 topic: figures-of-speech / doublet

וְ⁠אֶת־יָֽדְ⁠ךָ֙ הַֽ⁠חֲזָקָ֔ה וּֽ⁠זְרֹעֲ⁠ךָ֖ הַ⁠נְּטוּיָ֑ה

and=DOM hand_of,your (Some words not found in UHB: that/for/because/then/when people,will_hear DOM name_of,your (the),great and=DOM hand_of,your (the),mighty and,arm_of,your (the),outstretched and,he_will_come and,he_will_pray to/towards the,house (the),this )

The expressions mighty hand and outstretched arm mean similar things. Both the hand and the arm represent the power that Yahweh has used to do great things. Solomon is using the two expressions together for emphasis. If it would be clearer for your readers, you could express the emphasis with a single phrase. If you have already translated the book of Deuteronomy, see how you translated the similar expression in Deuteronomy 4:34 and its several other occurrences in that book. Alternate translation: [and the very powerful things you have done]

Note 4 topic: figures-of-speech / activepassive

וּֽ⁠זְרֹעֲ⁠ךָ֖ הַ⁠נְּטוּיָ֑ה

and,arm_of,your (Some words not found in UHB: that/for/because/then/when people,will_hear DOM name_of,your (the),great and=DOM hand_of,your (the),mighty and,arm_of,your (the),outstretched and,he_will_come and,he_will_pray to/towards the,house (the),this )

The term outstretched is a passive verbal form. If your language would not use that form, if you choose to retain the image, you could express the idea in active form or in another way that is natural in your language. Alternate translation: [and the arm that you have stretched out]