It is narrated from Hazrat Ma'qil (may Allah be pleased with him) that once my mother intended to perform Hajj, so the Prophet (peace and blessings be upon him) said: Perform Umrah in Ramadan, for performing Umrah in Ramadan is like Hajj.
Hadith Referenceمسند احمد / من مسند القبائل / 27291
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد مختلف فيه ألوانا