Nafi reported,

Ibn Umar intended to perform the Hajj in the year of the Haruriyya's pilgrimage during the time of Ibn Zubayr . He was told, "There is going to be fighting among the people, and we fear they may prevent you from reaching the House."He replied, "You have indeed in the Messenger of Allah an excellent example to follow" [Ahzab 33:21]. "In that case, I will do as he did. I call you to witness that I have made an Umra obligatory upon myself."When he reached the open plain of al-Bayda, he said, "The Hajj and the Umra are but one. I call you to witness that I have combined a Hajj with an Umra." He brought along a sacrificial animal which he had bought and garlanded.When he arrived, he performed the tawaf around the House and the saee between Safa and Marwa, and he did no more than that. He did not consider himself released from any of the restrictions of ihram until the Day of Sacrifice, when he shaved his head and slaughtered his animal. He held that his initial tawaf had fulfilled the circumambulation for both his Hajj and his Umra.Then he said, "This is exactly what the Prophet ﷺ did."

حدثنا إبراهيم بن المنذر حدثنا أبو ضمرة حدثنا موسى بن عقبة

عن نافع قال

أراد ابن عمر رضي الله عنهما الحج عام حجة الحرورية في عهد ابن الزبير رضي الله عنهما فقيل له إن الناس كائن بينهم قتال ونخاف أن يصدوك فقال {لقد كان لكم في رسول الله أسوة حسنة} إذا أصنع كما صنع أشهدكم أني أوجبت عمرة حتى إذا كان بظاهر البيداء قال ما شأن الحج والعمرة إلا واحد أشهدكم أني قد جمعت حجة مع عمرة وأهدى هديا مقلدا اشتراه حتى قدم فطاف بالبيت وبالصفا ولم يزد على ذلك ولم يحلل من شيء حرم منه حتى يوم النحر فحلق ونحر ورأى أن قد قضى طوافه الحج والعمرة بطوافه الأول ثم قال كذلك صنع النبي ﷺ