Jami` at-Tirmidhi, Hadith 2469 ⓘ
'Aishah narrated: "The Messenger of Allah (s.a.w) had a leather cushion stuffed with palm fibres which he would lean on."
حَدَّثَنَا هَنَّادٌ، حَدَّثَنَا عَبْدَةُ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتْ كَانَتْ وِسَادَةُ رَسُولِ اللَّهِ صلى الله عليه وسلم الَّتِي يَضْطَجِعُ عَلَيْهَا مِنْ أَدَمٍ حَشْوُهَا لِيفٌ . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ صَحِيحٌ .
also referenced under: Book 37, Hadith 2657 (In-Book) & Volume 4, Book 35, Hadith 2469 (DarusSalam)