Bahá'u'lláh had four paternal uncles. Among those to whom He
taught the Faith of the Báb in Nur were these uncles. Two of them rejected the
Cause of God and actively rose up against it. These were Shaykh Aziz'u'llah and
Safi Quli Big. The other two, Mulla Zaynu'l-'Abidin and Karbila'i Zaman, became
ardent believers. The former accompanied Bahá'u'lláh to the fortress of Shaykh
Tabarsi, and when Bahá'u'lláh was bastinadoed in Amul, threw himself upon His
feet and was beaten so much that he fainted.
(Adib Taherzadeh, The Revelation
of Baha'u'llah vol. 2)