Ash-Shama'il Al-Muhammadiyah, Book 54, Hadith 382 (English)

'Amr bin Al Haarith Radiyallahu 'Anhu, the brother of Ummul Mumineen Juwayriyyah Radiyallahu 'Anha says that Rasulullah Sallallahu 'Alayhi Wasallam left in his assets only weapons, a mule which he used as a conveyance, and some land, which he had declared sadaqah.

حَدَّثَنَا أَحْمَدُ بْنُ مَنِيعٍ، قَالَ‏:‏ حَدَّثَنَا حُسَيْنُ بْنُ مُحَمَّدٍ، قَالَ‏:‏ حَدَّثَنَا إِسْرَائِيلُ، عَنْ أَبِي إِسْحَاقَ، عَنْ عَمْرِو بْنِ الْحَارِثِ، أَخِي جُوَيْرِيَةَ لَهُ صُحْبَةٌ، قَالَ‏:‏ مَا تَرَكَ رَسُولُ اللهِ صلى الله عليه وسلم إِلا سِلاحَهُ، وَبَغْلَتَهُ، وَأَرْضًا جَعَلَهَا صَدَقَةً‏.‏

also referenced under: Book 55, Hadith 399 (In-Book)