Musnad Ahmad 27:1060

Muhammad ibn Abi ‘Adi narrated to us, from Humayd, from Bakr, who said: I mentioned to ‘Abdullah ibn ‘Umar that Anas had narrated to him that the Messenger of Allah (ﷺ) performed the Talbiyah for ‘Umrah and Hajj. Ibn ‘Umar said: "May Allah have mercy on Anas. And what is Anas? Did we go out with the Messenger of Allah (ﷺ) except as pilgrims (Hajjis)? When we arrived, he commanded us to make it an ‘Umrah, except for those who had the sacrificial animal with them." He said: So I narrated that to Anas, and he became angry and said: "He does not consider us to be anything but children."