Musnad Ahmad 28:498

'Affan narrated to us, Abu 'Awanah narrated to us, Abu Bishr narrated to us, from Yusuf ibn Mahak, from 'Abdullah ibn 'Amr, who said: The Messenger of Allah (peace and blessings of Allah be upon him) lagged behind us on a journey we were taking. He caught up with us while the time for the 'Asr prayer had already overtaken us. We were performing ablution, and we began wiping over our feet. He called out at the top of his voice: "Woe to the heels from the Fire," two or three times.