وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عُثْمَانَ بْنَ عَفَّانَ، كَانَ إِذَا اعْتَمَرَ رُبَّمَا لَمْ يَحْطُطْ عَنْ رَاحِلَتِهِ حَتَّى يَرْجِعَ ‏.‏ قَالَ مَالِكٌ الْعُمْرَةُ سُنَّةٌ وَلاَ نَعْلَمُ أَحَدًا مِنَ الْمُسْلِمِينَ أَرْخَصَ فِي تَرْكِهَا ‏.‏ قَالَ مَالِكٌ وَلاَ أَرَى لأَحَدٍ أَنْ يَعْتَمِرَ فِي السَّنَةِ مِرَارًا ‏.‏ قَالَ مَالِكٌ فِي الْمُعْتَمِرِ يَقَعُ بِأَهْلِهِ إِنَّ عَلَيْهِ فِي ذَلِكَ الْهَدْىَ وَعُمْرَةً أُخْرَى يَبْتَدِئُ بِهَا بَعْدَ إِتْمَامِهِ الَّتِي أَفْسَدَ وَيُحْرِمُ مِنْ حَيْثُ أَحْرَمَ بِعُمْرَتِهِ الَّتِي أَفْسَدَ إِلاَّ أَنْ يَكُونَ أَحْرَمَ مِنْ مَكَانٍ أَبْعَدَ مِنْ مِيقَاتِهِ فَلَيْسَ عَلَيْهِ أَنْ يُحْرِمَ إِلاَّ مِنْ مِيقَاتِهِ ‏.‏ قَالَ مَالِكٌ وَمَنْ دَخَلَ مَكَّةَ بِعُمْرَةٍ فَطَافَ بِالْبَيْتِ وَسَعَى بَيْنَ الصَّفَا وَالْمَرْوَةِ وَهُوَ جُنُبٌ أَوْ عَلَى غَيْرِ وُضُوءٍ ثُمَّ وَقَعَ بِأَهْلِهِ ثُمَّ ذَكَرَ - قَالَ - يَغْتَسِلُ أَوْ يَتَوَضَّأُ ثُمَّ يَعُودُ فَيَطُوفُ بِالْبَيْتِ وَيَسْعَى بَيْنَ الصَّفَا وَالْمَرْوَةِ وَيَعْتَمِرُ عُمْرَةً أُخْرَى وَيُهْدِي وَعَلَى الْمَرْأَةِ إِذَا أَصَابَهَا زَوْجُهَا وَهِيَ مُحْرِمَةٌ مِثْلُ ذَلِكَ ‏.‏ قَالَ مَالِكٌ فَأَمَّا الْعُمْرَةُ مِنَ التَّنْعِيمِ فَإِنَّهُ مَنْ شَاءَ أَنْ يَخْرُجَ مِنَ الْحَرَمِ ثُمَّ يُحْرِمَ فَإِنَّ ذَلِكَ مُجْزِئٌ عَنْهُ إِنْ شَاءَ اللَّهُ وَلَكِنِ الْفَضْلُ أَنْ يُهِلَّ مِنَ الْمِيقَاتِ الَّذِي وَقَّتَ رَسُولُ اللَّهِ صلى الله عليه وسلم أَوْ مَا هُوَ أَبْعَدُ مِنَ التَّنْعِيمِ ‏.‏

Yahya related to me from Malik that he had heard that Uthman ibnAffan would sometimes never get down from the animal he was riding onwhen he was doing umra, until he had returned . Malik said,''Umra is a sunna, and we do not know of any muslim who has ever saidthat it is permissible not to do it." Malik said, "I do notthink that anyone can do more than one umra in any one year." Malik said that someone doing umra who had sexual intercourse with hiswife had to sacrifice an animal and do a second umra, which he had tobegin when he had finished the one that he had spoiled. He should gointo ihram at the same place where he went into ihram for the umrawhich he had spoiled, except if he had entered into ihram at a placefurther away than his miqat. This was because he only had to go intoihram from his miqat. Malik said, "Someone who entered Makkato do umra, and does tawaf of the House and say between Safa and Marwawhile he is junub, or not in wudu, and afterwards has intercourse withhis wife, and then remembers, should do ghusl, or wudu, and then goback and do tawaf around the House and say between Safa and Marwa anddo another umra and sacrifice an animal. A woman should do the same ifher husband has intercourse with her while she is in ihram. " Malik said, "As for beginning umra at at-Tanim, (it is not the onlyalternative). It is permissible if Allah wills for some one to leavethe Haram and go into ihram if he wishes, but the best way is for himto go into ihram at the miqat which the Messenger of Allah, may Allahbless him and grant him peace, used (i.e. at-Tanim), or one which isfurther away." Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 773
Web Ref:  Muwatta Imam Malik Book 20 Hadith 69