Ibn Umar and I were leaning against the chamber of Ayesha, and we could hear her brushing her teeth.I said, "Abu Abdul-Rahman, did the Prophet ﷺ perform Umrah in Rajab?"He replied, "Yes."I said, "Mother, do you hear what Abu Abdul-Rahman is saying?"She asked, "What is he saying?"I said, "He says the Prophet ﷺ performed Umrah in Rajab."She said, "May Allah forgive Abu Abdul-Rahman. He has forgotten. The Prophet ﷺ did not perform Umrah in Rajab."Ibn Umar was listening, yet he said neither no nor yes. He remained silent.
حدثنا يحيى عن ابن جريج قال سمعت عطاء يقول أخبرني
كنت أنا وابن عمر مستندين إلى حجرة عائشة إنا لنسمعها تستن قلت يا أبا عبد الرحمن اعتمر النبي ﷺ في رجب قال نعم قلت يا أمتاه ما تسمعين ما يقول أبو عبد الرحمن قالت ما يقول قلت يقول اعتمر النبي ﷺ في رجب قالت يغفر الله لأبي عبد الرحمن نسي ما اعتمر النبي ﷺ في رجب قال وابن عمر يسمع فما قال لا ولا نعم سكت
Its isnad is sahih. Bukhari related it, 3/559, no. 1777, in Umrah, as did Muslim, 2/916, no. 936, and Tirmidhi, 3/265, no. 936, who graded it hasan, and Ibn Majah, 2/998, no. 2998, all of them in Hajj.