In Jain dharma, pap karma for falsehood depends mainly on intention, attachment, and delusion.

If you truly did not know something was a lie and had no way to know it, then it is not the same as intentional lying. So the grave sin of knowingly speaking a lie does not apply in the same way.

However, Jain teaching also says that karma can still bind through ignorance, carelessness, and delusion. So if a false statement is spoken without knowledge, it may still create some karmic effect, but much less than deliberate lying.

In simple words:

• Knowing lie + speaking it deliberately = strong pap karma
• Not knowing it is false, with no fault of intention = very little fault, and not the same as lying
• Careless speech without proper caution = some karmic bond may still happen

So the key is: Jainism judges the inner intention and awareness very deeply.

If you want, I can also explain this according to samyak bhāshā and the 5 great vows / 5 small vows in Jainism.