Sahih Muslim 1722 b
Zaid b. Khalid al-Juhani reported that a person asked Allah's Apostle (ﷺ) about picking up of stray articles, whereupon he said:
Make announcement about it for a year, and recognise well the strap and the bag (containing that) ; then spend that; and if its owner comes, make him the payment of that. He (the inquirer) said: Messenger of Allah, what about the lost goat? he said: Take it, for that is yours or for your brother, or for the wolf. He (again) said: (What about) the lost camel? The Messenger of Allah (ﷺ) was enraged until his cheeks became red (or his face became red) and then said: You have nothing to do about that; it has feet and a leather bag (to quench its thirst) until its owner finds it.
وَحَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ، وَقُتَيْبَةُ، وَابْنُ، حُجْرٍ قَالَ ابْنُ حُجْرٍ أَخْبَرَنَا وَقَالَ الآخَرَانِ، حَدَّثَنَا إِسْمَاعِيلُ، - وَهْوَ ابْنُ جَعْفَرٍ - عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ، عَنْ يَزِيدَ، مَوْلَى الْمُنْبَعِثِ عَنْ زَيْدِ بْنِ خَالِدٍ الْجُهَنِيِّ، أَنَّ رَجُلاً، سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنِ اللُّقَطَةِ فَقَالَ ‏"‏ عَرِّفْهَا سَنَةً ثُمَّ اعْرِفْ وِكَاءَهَا وَعِفَاصَهَا ثُمَّ اسْتَنْفِقْ بِهَا فَإِنْ جَاءَ رَبُّهَا فَأَدِّهَا إِلَيْهِ ‏"‏ ‏.‏ فَقَالَ يَا رَسُولَ اللَّهِ فَضَالَّةُ الْغَنَمِ قَالَ ‏"‏ خُذْهَا فَإِنَّمَا هِيَ لَكَ أَوْ لأَخِيكَ أَوْ لِلذِّئْبِ ‏"‏ ‏.‏ فَقَالَ يَا رَسُولَ اللَّهِ فَضَالَّةُ الإِبِلِ قَالَ فَغَضِبَ رَسُولُ اللَّهِ صلى الله عليه وسلم حَتَّى احْمَرَّتْ وَجْنَتَاهُ - أَوِ احْمَرَّ وَجْهُهُ - ثُمَّ قَالَ ‏"‏ مَا لَكَ وَلَهَا مَعَهَا حِذَاؤُهَا وَسِقَاؤُهَا حَتَّى يَلْقَاهَا رَبُّهَا ‏"‏ ‏.‏