Bulugh al-Maram 7 Business Transactions كتاب البيوع 180

وَفِي رِوَايَةٍ لِلْبُخَارِيِّ : { تَصَدَّقْ بِأَصْلِهِ , لَا يُبَاعُ وَلَا يُوهَبُ , وَلَكِنْ يُنْفَقُ ثَمَرُهُ } 1 . 1 – البخاري برقم (2764).

A narration by al-Bukhari has: “He gave the land in Sadaqah (as an endowment) that must not be sold or gifted, but its produce must be spent (as Sadaqah).”