הלכה על ברכות 86:8

From the laws of the commandment is that which they, may their memory be blessed, said (Yoma 86b) that we were not warned like this about all things, but rather [only] about things between a man and his fellow. But with Heavenly matters - if he does not return after the private rebuke - it is a commandment to shame him publicly, to publicize his sin and to disgrace and curse him until he returns to the good, as the prophets did to Israel. And [also] that which they, may their memory be blessed, said (Berakhot 43b) by way of a warning about this matter, " From where do we [know that] it is better for a man to descend into a fiery furnace, and not to whiten the face of his fellow in public? From Tamar," who did not want to whiten the face of her father-in-law, to say in public that she was pregnant from him. And had she not found the pledge and let the matter be known through a hint, she would have been condemned to burning; but she did not whiten his face. And the rest of the details of the commandment are in scattered places in the Gemara and in the Midrash.