Mishkat al-Masabih 28 Events of the Day of Resurrection and the Beginning of Creation كتاب أحوال القيامة وبدء الخلق 103

وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَا فِي الْجَنَّةِ شَجَرَةٌ إِلَّا وساقُها من ذهب» . رَوَاهُ التِّرْمِذِيّ

He reported God’s messenger as saying, “The trunk of every tree in paradise is of gold.” Tirmidhi transmitted it.