Sahih al-Bukhari 1782
Narrated Ata:
I heard Ibn `Abbas saying, "Allah's Messenger (ﷺ) asked an Ansari woman (Ibn `Abbas named her but `Ata' 
forgot her name), 'What prevented you from performing Hajj with us?' She replied, 'We have a camel 
and the father of so-and-so and his son (i.e. her husband and her son) rode it and left one camel for us 
to use for irrigation.' He said (to her), 'Perform `Umra when Ramadan comes, for `Umra in Ramadan 
is equal to Hajj (in reward),' or said something similar."
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنِ ابْنِ جُرَيْجٍ، عَنْ عَطَاءٍ، قَالَ سَمِعْتُ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ يُخْبِرُنَا يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم لاِمْرَأَةٍ مِنَ الأَنْصَارِ سَمَّاهَا ابْنُ عَبَّاسٍ، فَنَسِيتُ اسْمَهَا ‏"‏ مَا مَنَعَكِ أَنْ تَحُجِّي مَعَنَا ‏"‏‏.‏ قَالَتْ كَانَ لَنَا نَاضِحٌ فَرَكِبَهُ أَبُو فُلاَنٍ وَابْنُهُ ـ لِزَوْجِهَا وَابْنِهَا ـ وَتَرَكَ نَاضِحًا نَنْضَحُ عَلَيْهِ قَالَ ‏"‏ فَإِذَا كَانَ رَمَضَانُ اعْتَمِرِي فِيهِ فَإِنَّ عُمْرَةً فِي رَمَضَانَ حَجَّةٌ ‏"‏‏.‏ أَوْ نَحْوًا مِمَّا قَالَ‏.‏