en_tn_lite_do_not_use/deu/33/28.md

Israel dwelt ... Jacob's spring was secure

Possible meanings are 1) Moses speaks of the future as if it were the past to emphasize that what he is saying will come true, "Israel will dwell ... Jacob's spring will be secure" or 2) Moses is blessing Israel, "May Israel dwell ... and may Jacob's spring be secure." (See: rc://en/ta/man/jit/figs-pastforfuture)

Jacob's spring

Possible meanings are 1) Jacob's home or 2) Jacob's descendants. (See: rc://en/ta/man/jit/figs-metonymy)

let his heavens drop dew

The dew is spoken of as being so much that it is as if it were raining. Possible meanings are 1) Moses is blessing Israel, "may much dew cover the land like rain" or 2) Moses is telling what will happen in the future, "much dew will cover the land like rain." (See: rc://en/ta/man/jit/figs-metaphor)

dew

water that forms on leaves and grass on cool mornings. See how you translated this in Deuteronomy 32:2.