Musannaf Ibn Abi Shayba 3:1487

Waki' narrated to us, from Zakariya, from Abu Ishaq, from 'Amr ibn Maymun, who said: I prayed two rak'ahs with 'Umar in Makkah. Then he said: "O people of Makkah, we are a traveling people, so complete the prayer."