Salamah bin Kuhayl (may Allah have mercy on him) said: I heard Suwayd bin Ghafalah (may Allah have mercy on him) say: I was on a military expedition and I found a whip and took it. Zayd bin Suhan and Salman bin Rabi'ah (may Allah be pleased with them both) said to me: Throw it away. I refused. We completed the expedition, then I performed Hajj, and I passed through Madinah and met Ubayy bin Ka'b (may Allah be pleased with him). I mentioned this story, and he said to me: In the time of the Messenger of Allah (peace and blessings be upon him) I found a purse of a hundred dinars. I took it to the Messenger of Allah (peace and blessings be upon him) and he (peace and blessings be upon him) said to me: "Announce it for a year." I announced it for a year but found no one who would recognise it. Then I came to the Messenger of Allah (peace and blessings be upon him) and he (peace and blessings be upon him) said: "Announce it for a year." I did so, then came back to the Messenger of Allah (peace and blessings be upon him) and he (peace and blessings be upon him) said: "Announce it for another year." I did so, then came back to the Messenger of Allah (peace and blessings be upon him) a fourth time, and he (peace and blessings be upon him) said: "Count them and remember its tie well. If its owner comes, give it to him; otherwise make use of it." Salamah (may Allah have mercy on him) said: I do not know whether he (peace and blessings be upon him) told him to announce it three times or once.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللقطة / 12091