A woman of Banu Asad, who was called Umm Ma'qil (may Allah be pleased with her), narrates: I intended to perform Hajj, but my camel went astray, so I asked the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) said: "Perform Umrah in the month of Ramadan, for an Umrah in the month of Ramadan is equal to a Hajj."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21833