2nd Coming of Christ by -D. Yamartino- 1 Para
Chapter of  19

Baha'u'llah was also asked to perform miracles:
It often happened that in Baghdad certain Muhammadan ulama [Muslim priests], Jewish rabbis and Christians met together with some European scholars, in a blessed reunion: each one had some question to propose, and although they were possessed of varying degrees of culture, they each heard a suffcient and convincing reply, and retired satisfied. Even the Persian ulama who were at Karbila and Najaf chose a wise man whom they sent on a mission to Him; his name was Mulla Hasan Amu. He came into the Holy Presence, and proposed a number of questions on behalf of the ulama, to which Baha'u'llah replied. Then Hasan Amu said, 'The ulama recognize without hesitation and confess the knowledge and virtue of Baha'u'llah, and they are unanimously convinced that in all learning he has no peer or equal; and it is also evident that he has never studied or acquired this learning; but still the ulama say, "We are not contented with this; we do not acknowledge the reality of his mission by virtue of his wisdom and righteousness. Therefore, we ask him to show us a miracle in order to satisfy and tranquilize our hearts.'" (11:19)

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