OET interlinear GEN 15:13

uW Translation Notes:

יָדֹ֨עַ תֵּדַ֜ע כִּי

to_know (Some words not found in UHB: and=he/it_said to,Abram to_know you_know that/for/because/then/when aliens will_belong your(ms)=seed/fruit in=land not to/for=them and,they,will_serve_them and,they_will_afflict DOM=them four hundreds year )

Alternate translation: [You can be sure that]

Note 1 topic: figures-of-speech / explicit

גֵ֣ר ׀ יִהְיֶ֣ה

aliens will_belong

The author assumes that readers will know to whom he refers with the word strangers. You could say that explicitly if that would be helpful to your readers. The word strangers refers to people who live temporarily in a city, country, or region, but they do not settle there permanently. Alternate translation: [will live as sojourners]

לֹ֣א לָ⁠הֶ֔ם

not to/for=them

Alternate translation: [that is not their home]

Note 2 topic: writing-pronouns

וַ⁠עֲבָד֖וּ⁠ם

and,they,will_serve_them

Make sure that your translation of these pronouns clearly communicates to whom they refer. Alternate translation: [Your descendants will serve the people in that land as slaves] or [Your offspring will be slaves for the people who live in that land]

Note 3 topic: writing-pronouns

וְ⁠עִנּ֣וּ אֹתָ֑⁠ם

and,they_will_afflict DOM=them

Notice that in the final clause, the pronoun they refers to the citizens in the country where Abram’s descendants will sojourn, and them refers to Abram’s descendants. Make sure that is clear in your translation. Alternate translation: [and the citizens will oppress your offspring] or [and the people of that land will mistreat your descendants]

Note 4 topic: figures-of-speech / infostructure

יָדֹ֨עַ תֵּדַ֜ע כִּי־גֵ֣ר ׀ יִהְיֶ֣ה זַרְעֲ⁠ךָ֗ בְּ⁠אֶ֨רֶץ֙ לֹ֣א לָ⁠הֶ֔ם וַ⁠עֲבָד֖וּ⁠ם וְ⁠עִנּ֣וּ אֹתָ֑⁠ם אַרְבַּ֥ע מֵא֖וֹת שָׁנָֽה

to_know (Some words not found in UHB: and=he/it_said to,Abram to_know you_know that/for/because/then/when aliens will_belong your(ms)=seed/fruit in=land not to/for=them and,they,will_serve_them and,they_will_afflict DOM=them four hundreds year )

The final phrase refers to how long Abram’s descendants would live in a land that is not theirs, not how long they would be oppressed, which was less than half of those 400 years. To make that clear in your translation, you could move this phrase earlier in the sentence. Alternate translation: [I want you to know that for 400 years your offspring will live in a land that is not their own, and the people of that country will oppress them]