How to cure "if I blamed someone who we should not blame"? According to the Buddha's teaching, how can one cure the offense of "blaming someone who we should not blame"? Here "someone" means from Sotapanna to Arahant; and "blame" means to accuse that what he/she does (or what he/she does not do) is done (or not done) in not a good way. 

Is there any chance that normal people like me can blame Sotapanna - Arahant in a way he/she is not doing good?

If I should not blame and I blamed, how can it be cured so that I do not accuse improperly and do not make any harm to myself?

What is Buddha's teaching said about it?

What is proper way of curing to completely remove the burden of accusing the noble being? How it can be done in details?

Even if it is not in direct Buddha's teachings or in Dhamma, is there any example or something that had been done before in some past experiences?
There's no completely escaping the consequences of a bad deed unless the Karma becomes defunct. But you can do much to mitigate the effects.


If the monk is alive, apologize in person. If he is dead, think of him and apologize.
Do good deeds. ex: offering alms to the monk you insulted or to the Sagha as a whole.
Do meditation. ex: Spreading Metta to all beings, practicing the four foundations of mindfulness etc.


All of the above will help a great deal, but only a Buddha would know what exactly you should do to make a Karma defunct, if it is possible.