'Amro bin al-Harith, the brother of Juwairiyah the mother of Believers (the wife of the Prophet (ﷺ)) narrated, 'When Allah's Messenger (ﷺ) died, he did not leave a Dinar or a Dirham, a slave or a slave-woman, or anything but his white she-mule, his weapons and a piece of land which he appointed as Sadaqah.' Related by Al-Bukhari.
English reference: Book 15, Hadith 1478
Arabic reference: Book 15, Hadith 1434