Hadith 8:269
‘Abd ar-Rahman b. ‘Uthman at-Taimi said that God’s Messenger prohibited taking what a pilgrim has dropped. Muslim transmitted it.
وَعَنْ عَبْدِ الرَّحْمَنِ بْنِ عُثْمَانَ التَّيَمِيِّ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَن لقطَة الْحَاج. رَوَاهُ مُسلم
Original Reference: Mishkat al-Masabih 3035