Sunan an-Nasa'i 887
سنن النسائي#887SahihIt was narrated that Musa bin Umair Al-Anbari and Qais bin Sulaim Al-Anbari said:"Alqamah bin Wa'il told us that his father said: "I saw the Messenger of Allah (ﷺ), when he was standing in prayer, holding his left hand with his right
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih Isnaad
Al-AlbaniSahih Isnaad
Zubair Ali ZaiIsnaad Sahih
In-book reference: 11:12