Hi….
There is a plausible explanation of the origin of the proverb in question above:
look before you leap = think of the consequences before you act, as in
You'd better check out all the costs before you buy a cellular phone--look before you leap.
This expression alludes to Aesop's fable about the fox who is unable to climb out of a well and persuades a goat to jump in. The fox then climbs on the goat's horns to get out, while the goat remains trapped.
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Regards.
V.