وَحَدَّثَنِي مَالِكٌ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْقَاسِمِ، أَنَّهُ سَمِعَ مَكْحُولاً الدِّمَشْقِيَّ، يَسْأَلُ الْقَاسِمَ بْنَ مُحَمَّدٍ عَنِ الْعُمْرَى، وَمَا يَقُولُ النَّاسُ فِيهَا فَقَالَ الْقَاسِمُ بْنُ مُحَمَّدٍ مَا أَدْرَكْتُ النَّاسَ إِلاَّ وَهُمْ عَلَى شُرُوطِهِمْ فِي أَمْوَالِهِمْ وَفِيمَا أُعْطُوا ‏.‏ قَالَ يَحْيَى سَمِعْتُ مَالِكًا يَقُولُ وَعَلَى ذَلِكَ الأَمْرُ عِنْدَنَا أَنَّ الْعُمْرَى تَرْجِعُ إِلَى الَّذِي أَعْمَرَهَا إِذَا لَمْ يَقُلْ هِيَ لَكَ وَلِعَقِبِكَ ‏.‏

Malik related to me from Yahya ibn Said that Abd ar-Rahman ibnal-Qasim ibn Muhammad heard Makhul ad-Dimashqi ask al-Qasim ibnMuhammad about the life pension and what people said about it. Al-Qasim ibn Muhammad said, "I have only come upon people who keep to theconditions they make about their property and what they are given." Yahya said that he heard Malik say, "What is done in ourcommunity is that the life pension reverts to the one who makes it alife pension unless he says, 'It belongs to you and your posterity.' " Translation Not Available

Book Ref: Muwatta Imam Malik Book 36 Hadith 1447
Web Ref:  Muwatta Imam Malik Book 36 Hadith 44