Baha'u'llah ... records that on one occasion, when visiting His future mother-in-law, He listened to a cleric with a large turban expounding on whether the arch-angel Gabriel was the greater or Qanbar, the servant of the Imam ‘Ali. He writes that although He was still but a boy, He was astonished at the ignorance of these elders and when an opportunity came, He expressed His thoughts saying that since Gabriel is stated in Qur’an to be the one through whom the Word of God is revealed to the prophet Muhammad, then even Qanbar's master the Imam ‘Ali would not reach that station. Baha'u'llah states that some time later, He visited Qum and was dismayed to find the same cleric expounding the same sort of pointless and fruitless discourse.
-Moojan Momen ('Baha’u’llah, A Short Biography')