حَدَّثَنِي حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ، أَنَّ عَبْدَ اللَّهِ بْنَ عَبَّاسٍ، وَعَبْدَ اللَّهِ بْنَ عُمَرَ سُئِلَا عَنْ رَجُلٍ كَانَتْ تَحْتَهُ امْرَأَةٌ حُرَّةٌ، فَأَرَادَ أَنْ يَنْكِحَ عَلَيْهَا أَمَةً، " فَكَرِهَا أَنْ يَجْمَعَ بَيْنَهُمَا "
Imam Malik (may Allah have mercy on him) was informed that Sayyiduna Abdullah bin Abbas and Sayyiduna Abdullah bin Umar (may Allah be pleased with them) were asked: If a man has a free woman in his marriage and then he wishes to marry a slave woman, what is the ruling? Both of them replied that it is disliked (makruh).