The Messenger of Allah ﷺ left behind nothing except his weapons, a white mule, and a piece of land which he designated as charity.
حدثنا عبد الرحمن عن سفيان وإسحاق يعني الأزرق قال حدثنا سفيان عن أبي إسحاق قال سمعت عمرو بن الحارث قال
ما ترك رسول الله ﷺ إلا سلاحه وبغلة بيضاء وأرضا جعلها صدقة
Its isnad is sahih, and its narrators are well-known and reliable. Bukhari related the hadith in 6/74, number 2873 of Fath, in the chapter on jihad, concerning the mule of the Prophet ﷺ. Nasai also related it in 6/229, number 3595, at the beginning of the chapter on endowments.