Musnad Ahmad 1260:2

Ad-Dahhak ibn Makhlad narrated to us, from Hajjaj as-Sawwaf, who said: Yahya ibn Abi Kathir narrated to me, from Ikrimah, from Duba'ah bint az-Zubayr ibn 'Abd al-Muttalib, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Enter into Ihram and say: 'My place of exiting Ihram is wherever You detain me.' For if you are detained or become ill, then you have exited from that [state of Ihram], your condition is upon your Lord, the Almighty and Majestic."