I entered the mosque with Urwa bin Zubayr, and there was Ibn Umar leaning against Ayesha's chamber while some people were praying the Duha prayer.Urwa said to him, "Abu Abdul-Rahman, what is this prayer?"He replied, "An innovation."Then Urwa asked him, "Abu Abdul-Rahman, how many times did the Messenger of Allah ﷺ perform Umrah?"He answered, "Four times, one of them in Rajab."Then we heard Ayesha brushing her teeth inside the chamber, so Urwa said to her, "Abu Abdul-Rahman claims that the Prophet ﷺ performed Umrah four times, one of them in Rajab."She responded, "May Allah have mercy on Abu Abdul-Rahman. The Prophet ﷺ never performed an Umrah except that he was with him, and he never performed Umrah in Rajab at all."
حدثنا يحيى بن آدم حدثنا مفضل عن منصور
دخلت مع عروة بن الزبير المسجد فإذا ابن عمر مستند إلى حجرة عائشة وأناس يصلون الضحى فقال له عروة أبا عبد الرحمن ما هذه الصلاة قال بدعة فقال له عروة أبا عبد الرحمن كم اعتمر رسول الله ﷺ فقال أربعا إحداهن في رجب قال وسمعنا استنان عائشة في الحجرة فقال لها عروة إن أبا عبد الرحمن يزعم أن النبي ﷺ اعتمر أربعا إحداهن في رجب فقالت يرحم الله أبا عبد الرحمن ما اعتمر النبي ﷺ إلا وهو معه وما اعتمر في رجب قط
Its isnad is sahih. Mufaddal is Ibn Muhalhil Saadi, whose reliability was already established at 2898, 2996. The hadith is a repeat of 6126, and a longer version appears at 6295, see also 6242.