وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ سُمَىٍّ، مَوْلَى أَبِي بَكْرِ بْنِ عَبْدِ الرَّحْمَنِ أَنَّهُ سَمِعَ أَبَا بَكْرِ بْنَ عَبْدِ الرَّحْمَنِ، يَقُولُ جَاءَتِ امْرَأَةٌ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَتْ إِنِّي قَدْ كُنْتُ تَجَهَّزْتُ لِلْحَجِّ فَاعْتَرَضَ لِي ‏.‏ فَقَالَ لَهَا رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ اعْتَمِرِي فِي رَمَضَانَ فَإِنَّ عُمْرَةً فِيهِ كَحِجَّةٍ ‏"‏ ‏.‏

Yahya related to me from Malik that Sumayy, the mawla of Abu Bakribn Abd ar-Rahman, heard Abu Bakribn Abd ar-Rahman say, "A woman cameto the Messenger of Allah, may Allah bless him and grant him peace,and said, 'I had arranged to do hajj, but I was prevented,' and theMessenger of Allah, may Allah bless him and grant him peace, said, 'Doumra in Ramadan, for doing umra in it is like doing hajj.' " Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 771
Web Ref:  Muwatta Imam Malik Book 20 Hadith 67