Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) performed three Umrahs before his Hajj, in the month of Dhu al-Qa'dah.
Imam al-Tabarani recorded this narration in al-Mu'jam al-Awsat, and its narrators are thiqat (trustworthy), except that there is disagreement about whether Sa'id bin al-Musayyib heard from Sayyiduna Umar (may Allah be pleased with him).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الحج / 5664