وَحَدَّثَنِي مَالِكٌ، عَنْ نَافِعٍ، أَنَّ رَجُلاً، وَجَدَ لُقَطَةً فَجَاءَ إِلَى عَبْدِ اللَّهِ بْنِ عُمَرَ فَقَالَ لَهُ إِنِّي وَجَدْتُ لُقَطَةً فَمَاذَا تَرَى فِيهَا فَقَالَ لَهُ عَبْدُ اللَّهِ بْنُ عُمَرَ عَرِّفْهَا ‏.‏ قَالَ قَدْ فَعَلْتُ ‏.‏ قَالَ زِدْ ‏.‏ قَالَ قَدْ فَعَلْتُ ‏.‏ فَقَالَ عَبْدُ اللَّهِ لاَ آمُرُكَ أَنْ تَأْكُلَهَا وَلَوْ شِئْتَ لَمْ تَأْخُذْهَا ‏.‏

Malik related to me from Nafi that a man found something and wentto Abdullah ibn Umar and said to him, "I have found something. What doyou think I should do about it?" Abdullah ibn Umar said to him,"Publicise it!" He said, "I have done so." He said, "Do it again." Hesaid, "I have done so." Abdullah said, "I do not order you to use it.If you wished, you could have left it." Translation Not Available

Book Ref: Muwatta Imam Malik Book 36 Hadith 1451
Web Ref:  Muwatta Imam Malik Book 36 Hadith 48