Hadith 8:3146
Abu Bakr narrated to us, he said: Hatim ibn Isma'il narrated to us, from Aflah, from al-Qasim, from 'Aisha, she said: We went out with the Messenger of Allah, may Allah bless him and grant him peace, having entered into the state of ihram for Hajj during the months of Hajj and the days of Hajj, until we arrived at Sarif. The Messenger of Allah, may Allah bless him and grant him peace, said to his companions: "Whoever among you does not have a sacrificial animal (hady) with him, and would like to change his ihram for Hajj into an 'Umrah, then let him do so."
حدثنا أبو بكر قال نا حاتم بن إسماعيل عن أفلح عن القاسم عن عائشة قالت خرجنا مع رسول الله صلى الله عليه وسلم مهلين بالحج في أشهر الحج وأيام الحج حتى قدمنا سرف فقال رسول الله صلى الله عليه وسلم لأصحابه من لم يكن منكم ساق هديا فأحب أن يهل من حجة بعمرة فليفعل