Urwah (may Allah have mercy on him) said: Ibn Umar (may Allah be pleased with them both) and I were sitting leaning against the chamber of Sayyidah Aishah (may Allah be pleased with her), and I could hear the sound of her using the miswak. I said: Did the Messenger of Allah (peace and blessings be upon him) perform Umrah in Rajab? He said: Yes! I said: O Mother, have you not heard what Abu Abd al-Rahman is saying? He says that the Messenger of Allah (peace and blessings be upon him) performed Umrah in Rajab. She said: May Allah have mercy on Abu Abd al-Rahman! The Messenger of Allah (peace and blessings be upon him) did not perform any Umrah but that Abu Abd al-Rahman was with him in it. The Messenger of Allah (peace and blessings be upon him) did not perform Umrah in Rajab.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8837