Sahih al-Bukhari 2437

It is related that Suwayd ibn Ghafala was heard to say, "I was with Salman ibn Rabi'a and Zayd ibn Suhan on an expedition when I found a whip. He said to me, 'Drop it,' and I said, 'No. If I find its owner, [I will give it to him,] otherwise I will use it.' When we went on hajj, I passed by Madina and asked Ubayy ibn Ka'b. He said, 'In the time of the Messenger of Allah, may Allah bless him and grant him peace, I found a purse containing a hundred dinars. I brought it to the Prophet, may Allah bless him and grant him peace, and he said, 'Publicise for a year.' I publicised it for a year and then I went to him and he said, 'Publicise it for a year.' I publicised it for a year and then went to him. He said, 'Publicise it for a year,' and I publicised it for a year and then went to him a fourth time. He said, 'Note the details its contents, container and string. If its owner comes, give it to him. Otherwise, use them.'" Salama related this and said, "I met him later in Makka and he said, 'I do not know whether it was three years or one year.'"