حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ سَعِيدَ بْنَ الْمُسَيَّبِ، سُئِلَ عَنِ الْمَرْأَةِ، تَشْتَرِطُ عَلَى زَوْجِهَا أَنَّهُ لاَ يَخْرُجُ بِهَا مِنْ بَلَدِهَا فَقَالَ سَعِيدُ بْنُ الْمُسَيَّبِ يَخْرُجُ بِهَا إِنْ شَاءَ ‏.‏ قَالَ مَالِكٌ فَالأَمْرُ عِنْدَنَا ذَلِكَ أَنَّهُ إِذَا شَرَطَ الرَّجُلُ لِلْمَرْأَةِ وَإِنْ كَانَ ذَلِكَ عِنْدَ عُقْدَةِ النِّكَاحِ أَنْ لاَ أَنْكِحَ عَلَيْكِ وَلاَ أَتَسَرَّرَ إِنَّ ذَلِكَ لَيْسَ بِشَىْءٍ إِلاَّ أَنْ يَكُونَ فِي ذَلِكَ يَمِينٌ بِطَلاَقٍ أَوْ عِتَاقَةٍ فَيَجِبُ ذَلِكَ عَلَيْهِ وَيَلْزَمُهُ ‏.‏

Yahya related to me from Malik that he had heard that Said ibnal-Musayyab was asked about a woman who made a stipulation on herhusband not to take her away from her town. Said ibn al-Musayyab said,"He takes her away if he wishes." Malik said, "The customamong us is that when a man marries a woman, and he makes a conditionin the marriage contract that he will not marry after her or take aconcubine, it means nothing unless there is an oath of divorce orsetting-free attached to it. Then it is obliged and required of him." Translation Not Available

Book Ref: Muwatta Imam Malik Book 28 Hadith 1110
Web Ref:  Muwatta Imam Malik Book 28 Hadith 16