Lady Umm Ma'qil (may Allah be pleased with her) narrated: I intended to perform Umrah in Ramadan, while her husband had given the she-camel in the way of Allah. I mentioned this to the Messenger of Allah (peace and blessings be upon him), so the Messenger of Allah (peace and blessings be upon him) said: "Give it to her, for performing Umrah in Ramadan (in terms of reward and merit) is equal to Hajj."
Hadith Referenceمسند اسحاق بن راهويه / كتاب المناسك / 316
Hadith Takhrij«سنن ابوداود ، كتاب المناسك ، رقم : 1990 ، 1988 . قال الالباني حسن صحيح ، سنن ترمذي ، رقم : 939 . سنن ابن ماجه ، رقم : 2995 ، 2991 . مسند احمد : 210/4 . 375/6 . مستدرك حاكم : 482/1»