Hadith.4650 - Ibrahim ibn Hashim narrated from Abdul Aziz ibn al-Muhtadi who said
I asked Imam Ali ibn Musa Ar-Ridha (as): "May I be sacrificed for you! My brother passed away, and I married his wife. Then my uncle came and claimed that he had secretly married her.
I asked her about this, and she strongly denied it, saying, 'There was never anything between me and him at all.'"
Imam (as) replied: "Her acknowledgment is binding upon you, and her denial is binding upon him."