Sunan Abi Dawud 988
سنن أبي داود#988Sahih‘Abd Allah b. al-Zubair said:When the Messenger of Allah(ﷺ) sat during the prayer( at the tashahhud), he placed his left foot under his right thigh and shin and spread his right foot and placed his left hand on his left knee and placed his right hand on his right thigh, and he pointed with his forefinger
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Muslim (579)
In-book reference: 2:599