Musnad Abu Ya'la al-Mawsili 1:40

Ubayd Allah ibn Umar al-Qawariri narrated to us, Yahya ibn Sa’id narrated to us, Abdullah ibn al-Mubarak narrated to us, Ma’mar narrated to us, from al-Zuhri, from Urwah, from al-Miswar ibn Makhramah and Marwan ibn al-Hakam, who both said: The Messenger of Allah (may Allah bless him and grant him peace) went out at the time of al-Hudaybiyyah with more than ten hundred (one thousand) of his companions. When they were at Dhu al-Hulayfah, the Prophet (may Allah bless him and grant him peace) garlanded the sacrificial animals, marked them, and entered into the state of ihram for Umrah. Then Urwah ibn Mas’ud al-Thaqafi came and said, "I see faces that are likely to flee and leave you." Abu Bakr said, "Suck the clitoris of al-Lat! Would we flee and leave him?"