Musnad Ahmad 695:18

Sufyan ibn 'Uyaynah narrated to us, from al-Zuhri, from 'Urwah ibn al-Zubayr, from Marwan and al-Miswar ibn Makhramah—one of them adding to the other—that: "The Messenger of Allah (ﷺ) went out in the year of al-Hudaybiyyah with more than a thousand of his companions. When he was at Dhu al-Hulayfah, he garlanded the sacrificial animals, marked them, and entered into the state of ihram from there." Sufyan said once: "For the 'Umrah," and he did not name al-Miswar. "And he sent a scout of his ahead of him, and the Messenger of Allah (ﷺ) traveled until, when he was..."