It's typically used in:
* Biblical or literary texts: You'll often find "saith" in translations of the Bible or other religious texts, as well as in older literature.
* Formal or poetic contexts: "Saith" can add an archaic or formal tone to writing, sometimes for effect.
Example:
* "He saith unto them, 'Fear not.'" (From the Bible)
Modern usage:
While "saith" is still understood, it's considered outdated in most modern writing. "Says" or "said" are the preferred forms in contemporary English.