A hadith like this has been narrated on the authority of Mansur, but he did not mention:

" On that very day He created the heavens and the earth," and he (the narrator) substituted the word" fighting" (qital) for" killing" (qatl), and further said:" No one is to pick up the dropped thing except one who makes a public announcement of it."

وَحَدَّثَنِي مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا يَحْيَى بْنُ آدَمَ، حَدَّثَنَا مُفَضَّلٌ، عَنْ مَنْصُورٍ، فِي هَذَا الإِسْنَادِ بِمِثْلِهِ وَلَمْ يَذْكُرْ ‏"‏ يَوْمَ خَلَقَ السَّمَوَاتِ وَالأَرْضَ ‏"‏ ‏.‏ وَقَالَ بَدَلَ الْقِتَالِ ‏"‏ الْقَتْلَ ‏"‏ ‏.‏ وَقَالَ ‏"‏ لاَ يَلْتَقِطُ لُقَطَتَهُ إِلاَّ مَنْ عَرَّفَهَا ‏"‏ ‏.‏