قَالَ مَالِك : وَإِنَّمَا تُبَاعُ الْعَرَايَا بِخَرْصِهَا مِنَ التَّمْرِ يُتَحَرَّى ذَلِكَ، وَيُخْرَصُ فِي رُءُوسِ النَّخْلِ، وَإِنَّمَا أُرْخِصَ فِيهِ لِأَنَّهُ أُنْزِلَ بِمَنْزِلَةِ التَّوْلِيَةِ وَالْإِقَالَةِ وَالشِّرْكِ، وَلَوْ كَانَ بِمَنْزِلَةِ غَيْرِهِ مِنَ الْبُيُوعِ مَا أَشْرَكَ أَحَدٌ أَحَدًا فِي طَعَامِهِ حَتَّى يَقْبِضَهُ الْمُبْتَاعُ
Imam Malik, may Allah have mercy on him, said that the estimation of ‘Ariyyah will be made on the trees, and the Messenger of Allah, peace and blessings be upon him, permitted it. This is like musawamah (bargaining), iqalah (cancellation of sale), or partnership. If it were like other types of sales, then musawamah, iqalah, or partnership of food items before taking possession would not be valid, and this too would not be valid.