OET interlinear EXO 13:15

uW Translation Notes:

Note 1 topic: figures-of-speech / metaphor

כִּֽי־הִקְשָׁ֣ה פַרְעֹה֮ לְ⁠שַׁלְּחֵ⁠נוּ֒

that/for/because/then/when stubbornly_refused Farˊoh to,let_~_go,us

If your readers would not understand what this image means in this context, you could use an equivalent metaphor from your culture. Alternatively, you could express the meaning plainly. This means he was stubborn. His stubborn attitude is spoken of as if he were hard. Alternate translation: “that when Pharaoh resisted letting us go”

Note 2 topic: figures-of-speech / merism

מִ⁠בְּכֹ֥ר אָדָ֖ם וְ⁠עַד־בְּכ֣וֹר בְּהֵמָ֑ה

from,firstborn humankind and=unto firstborn cattle/livestock

This is a figure of speech used to emphasize the extent of the plague, nothing was exempt. If it would be helpful in your language, you could use an equivalent expression or plain language. Alternate translation: “whether he was a person or an animal”