His face became red, his forehead too, and he felt annoyed; and made an addition after the words: He should make announcement of that for a year, and if its owner does not turn up, then it is a trust with you.
Sahih Muslim Book 31, Hadith 4
← Previous Hadith " There came a person to Allah's Messenger (ﷺ) while I was with him, and he asked him about picking up of a stray article, and he said: When none comes to demand it, then spend that."

Sahih Muslim Book 31, Hadith 3 Next Hadith → Recognise well the strap and the bag (containing) that and then make an announcement regarding that for one year, but if none recognises it, then spend that and it would be a trust with you; and if someone comes one day to make demand of that, then pay that to him. He (the inquirer) asked about the lost camel, whereupon he said: You have nothing to do with that. Leave that alone, for it has feet and also a leather bag, it drinks water, and eats (the leaves) of the trees. He asked him about sheep, whereupon he said: Take it, it is for you, or for your brother, or for the wolf.

Sahih Muslim Book 31, Hadith 5