en_tn/exo/04/23.md

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you have refused to let him go

The word "him" refers to the people of Israel as God's son. Alternate translation: "you have refused to let my son go" (See: rc://en/ta/man/translate/figs-metonymy)

I will certainly kill your son, your firstborn

The word "son" here refers to the actual son of Pharaoh.