(9) باب إِذَا جَاءَ صَاحِبُ اللُّقَطَةِ بَعْدَ سَنَةٍ رَدَّهَا عَلَيْهِ، لأَنَّهَا وَدِيعَةٌ عِنْدَهُ
Narrated Zaid bin Khalid Al-Juhani:
A man asked Allah's Messenger (ﷺ) about the Luqata. He said, "Make public announcement of it for one year, then remember the description of its container and the string it is tied with, utilize the money, and if its owner comes back after that, give it to him." The people asked, "O Allah's Messenger (ﷺ)! What about a lost sheep?" Allah's Messenger (ﷺ) said, "Take it, for it is for you, for your brother, or for the wolf." The man asked, "O Allah's Messenger (ﷺ)! What about a lost camel?" Allah's Messenger (ﷺ) got angry and his cheeks or face became red, and said, "You have no concern with it as it has its feet, and its watercontainer, till its owner finds it."
Reference: Sahih al-Bukhari 2436
In-book reference: Book 45, Hadith 11
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 42, Hadith 615