(152) بَابُ وَضْعِ الْيَدَيْنِ عَلَى الرُّكْبَتَيْنِ
Mus'ab b sa'd said:
I prayed by the side of my father. I put both of my hands between my knees(in bowing condition). He prohibited me from it. I then repeated; so he said: Do not do so, because we used to do so. But we were prohibited to do that, and commanded to put our hands on the knees.
Reference: Sunan Abi Dawud 867
In-book reference: Book 2, Hadith 477
English translation: Book 2, Hadith 866