Musnad Ahmad 792:16

Yazid narrated to us, Bahz bin Hakim informed us, from his father, from his grandfather, who said: I said, "O Messenger of Allah, where do you command me [to go]?" He said, "Here," and he gestured with his hand toward Ash-Sham. He said, "Indeed, you will be gathered on foot and riding, and you will be dragged upon your faces."