(a) Sayyidah Aishah (may Allah be pleased with her) said: We set out close to the new moon of Dhul-Hijjah, and the Messenger of Allah (peace and blessings be upon him) said: "Whoever of you wishes to make the talbiyah for Umrah, let him do so. Had I not brought a sacrificial animal with me, I too would have made the talbiyah for Umrah." Among the people were some who made the talbiyah for Umrah and some for Hajj, and I was among those who made the talbiyah for Umrah. I reached Makkah while menstruating, and the Day of Arafah came, so I told the Messenger of Allah (peace and blessings be upon him) about it. He (peace and blessings be upon him) said: "Leave your Umrah, undo your hair, comb it and make the talbiyah for Hajj." Then, when she returned and had completed her Hajj, the Messenger of Allah (peace and blessings be upon him) sent Abd al-Rahman bin Abi Bakr (may Allah be pleased with them both) with her on the night of al-Hasbah. He seated her behind him on his mount, and she then made the talbiyah for Umrah from al-Tan'im in place of her first Umrah, and in all this there was no sacrifice, fasting or charity.
(b) It is narrated from Sayyidah Aishah (may Allah be pleased with her) that we set out with the Prophet (peace and blessings be upon him) when the new moon of Dhul-Hijjah was about to appear, and the Messenger of Allah (peace and blessings be upon him) said: "Whoever of you would like to make the talbiyah for Hajj, let him make the talbiyah for Hajj, and whoever of you would like to make the talbiyah for Umrah, let him make the talbiyah for Umrah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8785