Sayyidina Urwab (RA) said that Sayyidina Ibn Umar was asked, “In which months did Allah’s Messenger (SAW) perform Umrah?” He said, “In Rajab.” But Sayyidah Ayshah (SAW) said, “He did not perform umrah but he, meaning Ibn Umar, was and he never performed umrah in Rajab.”
[Bukhari 1775, Muslim 1255, Abu Dawud 1992, Ibn e Majah 2998]