Sunan Abi Dawud 756
سنن أبي داود#756Da'ifNarrated Ali ibn AbuTalib: AbuJuhayfah said: Ali said that it is a sunnah to place one hand on the other in prayer below the navel
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniDaif
Muhammad Muhyi Al-Din Abdul HamidDaif
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 2:366