Has a sound, explicit narration been reported concerning the raising of the index finger and saying "Ashhadu" (I bear witness) when carrying the Janazah (funeral bier)?

There is no evidence in the Sunnah for the permissibility of raising the index finger (sababah) and reciting the tashahhud when carrying a funeral bier (janazah), nor has this been transmitted from the people of knowledge. The jurists have stated that whoever follows a funeral procession should remain silent and engage much in contemplation and reflection. A weak hadith transmitted by Al-Tabarani states that Allah loves silence at a funeral. Some jurists have held the view that remembrance (dhikr) at a funeral is recommended, though raising one's voice with it is disliked.