Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) was asked about a found item, and he said: "It is to be announced; it is not to be kept hidden, nor concealed. If its owner comes, well and good; otherwise, it is the wealth of Allah, which He gives to whomever He wills."
Al-Bazzar recorded it, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6839