Musannaf Ibn Abi Shaybah 8667 — Supplicating in prayer with one

Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with him) said: When the Prophet (peace and blessings be upon him) sat in the sitting (of the prayer), he would place his right hand on his right thigh and supplicate, and place his left hand on his left thigh. He would point with his index finger, place his thumb on his middle finger, and keep his left palm spread over his knee.