It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said to a woman: "Perform Umrah in Ramadan, for Umrah in Ramadan is equal to Hajj."
Hadith Referenceسنن دارمي / من كتاب المناسك / 1897
Hadith Takhrijاس روایت کی سند صحیح ہے اور حدیث متفق علیہ ہے۔ دیکھئے: [بخاري 1782] ، [مسلم 1256] ، [نسائي 2109] ، [ابن ماجه 2994] ، [ابن حبان 3700]
Brief Explanation
(Commentary on Hadith 1896)
That is, in terms of reward, performing ‘umrah in Ramadan is equal to Hajj, and the aforementioned woman was from among the Ansar, and her name was Umm Sinan or Umm Sulaym.