وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ حُمَيْدِ بْنِ قَيْسٍ الْمَكِّيِّ، عَنْ رَجُلٍ، يُقَالُ لَهُ ذَفِيفٌ أَنَّهُ قَالَ سُئِلَ ابْنُ عَبَّاسٍ عَنِ الْعَزْلِ فَدَعَا جَارِيَةً لَهُ فَقَالَ أَخْبِرِيهِمْ ‏.‏ فَكَأَنَّهَا اسْتَحْيَتْ ‏.‏ فَقَالَ هُوَ ذَلِكَ أَمَّا أَنَا فَأَفْعَلُهُ ‏.‏ يَعْنِي أَنَّهُ يَعْزِلُ ‏.‏ قَالَ مَالِكٌ لاَ يَعْزِلُ الرَّجُلُ عَنِ الْمَرْأَةِ الْحُرَّةِ إِلاَّ بِإِذْنِهَا وَلاَ بَأْسَ أَنْ يَعْزِلَ عَنْ أَمَتِهِ بِغَيْرِ إِذْنِهَا وَمَنْ كَانَتْ تَحْتَهُ أَمَةُ قَوْمٍ فَلاَ يَعْزِلُ إِلاَّ بِإِذْنِهِمْ ‏.‏

Yahya related to me from Malik from Humayd ibn Qays al-Makki thata man called Dhafif said that Ibn Abbas was asked about coitusinterruptus. He called a slave-girl of his and said, "Tell them." Shewas embarrassed. He said, "It is alright, and I do it myself." Malik said, "A man does not practise coitus interruptus with afree woman unless she gives her permission. There is no harm inpractising coitus interruptus with a slave-girl without herpermission. Someone who has someone else's slave-girl as a wife, doesnot practise coitus interruptus with her unless her people give himpermission." Translation Not Available

Book Ref: Muwatta Imam Malik Book 29 Hadith 1265
Web Ref:  Muwatta Imam Malik Book 29 Hadith 100