doesn't really give info on origin, But interesting anyway as a definition.
@zleap you will probably get a more useful result if you dont look it up in a dictionary but an etymology reference.
Seems you may have been right:
The phrase might be originated from the Egyptian mythology that says that the dead ones would go for judgment after death and their heart will be weighed against the Feather of Truth if their heart will weigh less, and then they will be sent to heaven by Osiris, the God.
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