en_tn_condensed/exo/12/42.md

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to be observed by all the people of Israel

This can be stated in active form. Alternate translation: "that all the people of Israel were to observe" (See: rc://en/ta/man/jit/figs-activepassive)

all the people of Israel throughout their people's generations

"all the people of Israel and the all the generations of their descendants"