Musannaf Ibn Abi Shayba 8:1448

Abu Bakr narrated to us, he said: Abbad bin al-Awwam narrated to us, from Hilal bin Khabbab, from Ikrimah, from Ibn Abbas: That Duba'ah, the daughter of Zubayr bin Abd al-Muttalib, came to the Prophet, peace and blessings of Allah be upon him, and said: "How should I say [the Talbiyah]?" He said: "Say: 'Labbayk Allahumma Labbayk (Here I am, O Allah, here I am), my place of exiting Ihram is wherever You restrain me.'"