Exodus 24:18

18And Moses, entering into the midst of the cloud, ascended the mountain. And he was there for forty days and forty nights.
24:18The expression ‘forty days and forty nights’ is not an approximate length of time. Whenever the reference is to ‘days and nights,’ the length of time is being presented as an exact length of time. The interpretation may be figurative, but the grammatical meaning is an exact length of time.(Conte)
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