Mujahid reported,

Urwa bin Zubayr and I entered the mosque, and there was Abdullah bin Umar رضي الله عنهم sitting beside Ayesha's chamber, while some people were praying the forenoon prayer in the mosque. We asked him about their prayer, and he said, "An innovation."Then Urwa asked him, "How many times did the Messenger of Allah ﷺ perform Umrah?"He replied, "Four times, one of them in Rajab."We disliked contradicting him.

Bukhari 1775

Sahih

حدثنا قتيبة حدثنا جرير عن منصور

عن مجاهد قال

دخلت أنا وعروة بن الزبير المسجد فإذا عبد الله بن عمر رضي الله عنهما جالس إلى حجرة عائشة وإذا ناس يصلون في المسجد صلاة الضحى قال فسألناه عن صلاتهم فقال بدعة ثم قال له كم اعتمر رسول الله ﷺ قال أربعا إحداهن في رجب فكرهنا أن نرد عليه

البخاري 1775صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Umrah
Chapter
How many times did the Prophet ﷺ perform umrah
Numbering
Darussalam 1775
Bukhari 1775