Musannaf Ibn Abi Shayba 3:2176

Abu Bakr narrated to us, he said: Abu Khalid al-Ahmar narrated to us, from Humayd, from Mu'awiyah ibn Qurrah, who said: It was said to Ibn Umar, "When Ibn al-Zubayr stands for prayer, he does not turn (his head) and he does not move." He said, "But we do turn and we do move."