Musannaf Ibn Abi Shaybah 31661 — Those who used to supplicate with one

Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with him) said: "When the Messenger of Allah (peace and blessings be upon him) sat to supplicate, he would place his right hand on his right thigh and his left hand on his left thigh. He would point with the index finger, with his thumb placed on the tip of the middle finger, and he would join his left palm to his knee."