In front of him, then he sat and spread his left leg, placed his left hand on his left thigh, and set the edge of his right elbow on his right thigh. He clenched two fingers and formed a ring, and I saw him saying: "Like this." Bishr formed a ring with his thumb and middle finger and pointed with his index finger. (1)

727 — Al-Hasan ibn Ali narrated to us, Abu al-Walid narrated to us, Za'idah narrated to us, from Asim ibn Kulayb, with the same chain of transmission and meaning. He said therein:

Then he placed his right hand on the back of his left palm, the wrist, and the forearm. And he said therein: Then I came after that at a time of severe cold, and I saw the people wearing heavy garments, their hands moving beneath the garments. (2)

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(1) Its chain of transmission is strong on account of Kulayb, who is Ibn Shihab al-Kufi.
Al-Nasa'i also recorded it in al-Kubra (1189), and Ibn Majah (867) via the route of Bishr ibn al-Mufaddal, with this chain.
Al-Nasa'i also recorded it in similar form (693) via the route of Abdullah ibn Idris, and (750) and (1187) via the route of Sufyan al-Thawri, both from Asim ibn Kulayb, with it.
It is in Musnad Ahmad (18850) and Sahih Ibn Hibban (1860).
Al-Tirmidhi recorded it in abbreviated form concerning the manner of sitting for the tashahhud (292) via the route of Abdullah ibn Idris, and al-Nasa'i (1188) via the route of Sufyan, both from Asim ibn Kulayb, with it. It will be repeated as number 957. See what preceded as number 723.
His statement: "and set the edge of his right elbow" means: he placed the edge of his right elbow on his right thigh, and the intent is that he separated between his elbow and his side and prevented them from adhering while using them on the thigh.

(2) Its chain of transmission is strong like the previous one. Abu al-Walid: he is Hisham ibn Abd al-Malik al-Tayalisi, and Za'idah: he is Ibn Qudamah.
Al-Nasa'i recorded it in al-Kubra (965) via the route of Za'idah ibn Qudamah, with this chain, and he did not mention therein the placing of the right hand on the left nor the story of the garments. =