It is narrated from Sayyidah Umm Sinan al-Ansariyyah (may Allah be pleased with her) that she intended to attain the honour of performing Hajj with the Messenger of Allah (peace and blessings be upon him), so he (peace and blessings be upon him) said to her: "Perform Umrah in Ramadan, for it is equal to a Hajj for you."
Sa'id bin Jubayr (may Allah have mercy on him) said that, as far as we know, this virtue was specifically for this woman alone. Ahmad bin Mani' also narrated a report with the same meaning from Sa'id bin Jubayr through another chain, via Isma'il and Ayyub.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الحج / 1286
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده صحيح. » «أخرجه المطالب العالية لابن حجر برقم: 1286 / 2»