"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.'"
Sunan an-Nasa'i Book 11, Hadith 12
← Previous Hadith "While we were praying with the Messenger of Allah (ﷺ), a man among the people said: 'Allahu Akbaru kabira, wal-hamdu Lillahi kathira, wa subhan-Allahi bukratan was asila (Allah is Most Great and much praise be to Allah and glorified be Allah at the beginning and end of the day).' The Messenger of Allah (ﷺ) said: 'Who is the one who said such and such?' A man among the people said: 'I did, O Messenger of Allah.' He said: ' I like it,' and he said words to the effect that the gates of the Heavens had been opened for it." Ibn Umar said: "I never stopped saying it since I heard the Messenger of Allah (ﷺ) say that."

Sunan an-Nasa'i Book 11, Hadith 11 Next Hadith → X"I heard Abu Uthman narrate that Ibn Mas'ud said: 'The Prophet (ﷺ) saw me when I had placed my left hand on my right in prayer. He took hold of my right hand and placed it on my left.'"

Sunan an-Nasa'i Book 11, Hadith 13