وَحَدَّثَنِي مَالِكٌ، أَنَّهُ بَلَغَهُ أَنَّ عَبْدَ اللَّهِ بْنَ مَسْعُودٍ، كَانَ يَقُولُ مَنْ أَسْلَفَ سَلَفًا فَلاَ يَشْتَرِطْ أَفْضَلَ مِنْهُ وَإِنْ كَانَتْ قَبْضَةً مِنْ عَلَفٍ فَهُوَ رِبًا ‏.‏ قَالَ مَالِكٌ الأَمْرُ الْمُجْتَمَعُ عَلَيْهِ عِنْدَنَا أَنَّ مَنِ اسْتَسْلَفَ شَيْئًا مِنَ الْحَيَوَانِ بِصِفَةٍ وَتَحْلِيَةٍ مَعْلُومَةٍ فَإِنَّهُ لاَ بَأْسَ بِذَلِكَ وَعَلَيْهِ أَنْ يَرُدَّ مِثْلَهُ إِلاَّ مَا كَانَ مِنَ الْوَلاَئِدِ فَإِنَّهُ يُخَافُ فِي ذَلِكَ الذَّرِيعَةُ إِلَى إِحْلاَلِ مَا لاَ يَحِلُّ فَلاَ يَصْلُحُ وَتَفْسِيرُ مَا كُرِهَ مِنْ ذَلِكَ أَنْ يَسْتَسْلِفَ الرَّجُلُ الْجَارِيَةَ فَيُصِيبُهَا مَا بَدَا لَهُ ثُمَّ يَرُدُّهَا إِلَى صَاحِبِهَا بِعَيْنِهَا فَذَلِكَ لاَ يَصْلُحُ وَلاَ يَحِلُّ وَلَمْ يَزَلْ أَهْلُ الْعِلْمِ يَنْهَوْنَ عَنْهُ وَلاَ يُرَخِّصُونَ فِيهِ لأَحَدٍ ‏.‏

Malik related to me that he had heard that Abdullah ibn Masudused to say, "If someone makes a loan, they should not stipulatebetter than it. Even if it is a handful of grass, it is usury." Malik said, "The generally agreed on way of doing things among usis that there is no harm in borrowing any animals with a setdescription and itemisation, and one must return the like of them.This is not done in the case of female slaves. It is feared about thatthat it will lead to making halal what is not halal, so it is notgood. The explanation of what is disapproved of in that, is that a manborrow a slave-girl and have intercourse with her as seems proper tohim. Then he returns her to her owner. That is not good and it is nothalal. The people of knowledge still forbid it and do not give anindulgence to any one in it." Translation Not Available

Book Ref: Muwatta Imam Malik Book 31 Hadith 1381
Web Ref:  Muwatta Imam Malik Book 31 Hadith 95