Abu Dawud Book 2, Hadith Number 1033.
Chapter : Not known.
Narated By Thawban : The Prophet (PBUH) said: For each forgetfulness there are two prostrations after giving the salutation.
No one except Amr (ibn Uthman) mentioned the words “from his father” (in the chain AbdurRahman ibn Jubayr ibn Nufayr from Thawban).