Musnad Abu Ya'la al-Mawsili 119:10

Muhammad ibn Abdullah ibn Numayr narrated to us, Yahya ibn Ya'la narrated to us, my father narrated to me, from Ghaylan ibn Jami', from Uthman ibn al-Mughirah, from Salim ibn Abi al-Ja'd, he said: Anas narrated to me, he said: I heard the Messenger of Allah (may Allah bless him and grant him peace) pronouncing the Talbiyah for Hajj and Umrah together, and my knees were touching his knees.