It is narrated from Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) that he carried one of the steps of the minbar from al-Ghabah (the forest) until he placed it in the mosque, and that the wood of the minbar was of athl (a kind of tree).
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5706