Ikrimah narrates from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that Sayyidah Duba'ah bint al-Zubayr (may Allah be pleased with her) said: O Messenger of Allah (peace and blessings be upon him), I intend to perform Hajj; shall I make a stipulation? He (peace and blessings be upon him) said: "Yes, make a stipulation." She said: What shall I say? He (peace and blessings be upon him) said: "Say: 'Labbayk Allahumma labbayk, mahilli min al-ard haythu habastani' (Here I am, O Allah, here I am; my place of leaving ihram on the earth is wherever You hold me back)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10111