ENOfficial
He reported God's messenger as saying, "The trunk of every tree in paradise is of gold." Tirmidhi transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَا فِي الْجَنَّةِ شَجَرَةٌ إِلَّا وساقُها من ذهب» . رَوَاهُ التِّرْمِذِيّ
sunnah.com