Sunan Abu Dawud
1719
Sahih+3

‘Abd al-Rahman bin `Uthman al-Taime said:The Messenger of Allah (SWAS) prohibited taking the find of pilgrims. Ibn Wahb said : One should leave the find of a pilgrim till its owner finds it

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid