Eid al-Mubahalah
According to Islamic sources, the event of Mubahala was a meeting between the Islamic prophet Muhammad and a Christian delegation from Najran, in the month of Dhu'l-Hijja, 10 AH, where Muhammad called for invoking a curse to reveal who was lying about their religious differences.
Additional information
https://en.wikipedia.org/wiki/Event_of_Mubahala
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