None dared to contend with His [Bahá’u’lláh's] views except His uncle Azíz,
who ventured to oppose Him, challenging His statements and aspersing their
truth. When those who heard him sought to silence this opponent and to injure
him, Bahá’u’lláh intervened in his behalf, and advised them to leave him in the
hands of God.
(Chapter 5, ‘The Dawn-Breakers’)