Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:687-76b – Um Sulaym al-Anṣāriyyah
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السيوطي:٦٨٧-٧٦b –

"عَنْ أُمِّ [سُلَيْمٍ] الأَنْصَارِيَّةِ قَالَتْ: قَالَ رَسُولُ اللهِ ﷺ : إِذَا كَانَ رَمَضَانُ أَوْ شَهْرُ الصَّوْمِ فَاعْتَمِري فِيهِ، فَإِنَّ عُمْرَةً فِيهِ مِثْلُ حَجَّةٍ أَوْ تَقْضِي مَكَانَ حَجَّةٍ".  

ابن زنجويه

See similar narrations below:

Collected by Nasāʾī
nasai:2110 – ʿImrān b. Yazīd b. Khālid > Shuʿayb > Ibn Jurayj > ʿAṭāʾ > Ibn ʿAbbās Yukhbirunā

"The Messenger of Allah said to a woman from among the Ansar: 'When it is Ramadan, perform 'Umrah then, for 'Umrah during it is equivalent to Hajj."  

النسائي:٢١١٠ – أَخْبَرَنَا عِمْرَانُ بْنُ يَزِيدَ بْنِ خَالِدٍ قَالَ حَدَّثَنَا شُعَيْبٌ قَالَ أَخْبَرَنِي ابْنُ جُرَيْجٍ قَالَ أَخْبَرَنِي عَطَاءٌ قَالَ سَمِعْتُ ابْنَ عَبَّاسٍ يُخْبِرُنَا قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ لاِمْرَأَةٍ مِنَ الأَنْصَارِ إِذَا كَانَ رَمَضَانُ فَاعْتَمِرِي فِيهِ فَإِنَّ عُمْرَةً فِيهِ تَعْدِلُ حَجَّةً