It was narrated that Suwaid bin Ghafalah said:“I went out with Zaid bin Suhan and Salman bin Rabi'ah, and when we were at `Udhaib, I found a whip. They said to me: 'Throw it away,' but I refused. When we came to Al-Madinah I went to Ubayy bin Ka'b and told him about that. He said: 'You did the right thing. I found one hundred dinar that had been lost at the time of the Messenger of Allah (ﷺ), and I asked him about it. He said, “Announce it for a year.” So I Announced it, and I did not find anyone who recognized it. He said: “Remember the features of its bag and strap, and how many it contains, then announce it for a year. If someone comes who describes it with those features, (give it to him), otherwise it is like your own property.”
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا سُفْيَانُ، عَنْ سَلَمَةَ بْنِ كُهَيْلٍ، عَنْ سُوَيْدِ بْنِ غَفَلَةَ، قَالَ خَرَجْتُ مَعَ زَيْدِ بْنِ صُوحَانَ وَسَلْمَانَ بْنِ رَبِيعَةَ حَتَّى إِذَا كُنَّا بِالْعُذَيْبِ الْتَقَطْتُ سَوْطًا فَقَالاَ لِي أَلْقِهِ . فَأَبَيْتُ فَلَمَّا قَدِمْنَا الْمَدِينَةَ أَتَيْتُ أُبَىَّ بْنَ كَعْبٍ فَذَكَرْتُ ذَلِكَ لَهُ فَقَالَ أَصَبْتَ الْتَقَطْتُ مِائَةَ دِينَارٍ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فَسَأَلْتُهُ فَقَالَ " عَرِّفْهَا سَنَةً " . فَعَرَّفْتُهَا فَلَمْ أَجِدْ أَحَدًا يَعْرِفُهَا فَسَأَلْتُهُ فَقَالَ " عَرِّفْهَا " . فَعَرَّفْتُهَا فَلَمْ أَجِدْ أَحَدًا يَعْرِفُهَا . فَقَالَ " اعْرِفْ وِعَاءَهَا وَوِكَاءَهَا وَعَدَدَهَا ثُمَّ عَرِّفْهَا سَنَةً فَإِنْ جَاءَ مَنْ يَعْرِفُهَا وَإِلاَّ فَهِيَ كَسَبِيلِ مَالِكَ " .
IbnMaja
The Chapters on Lost Property • Hadith 2506