Sunan Abi Dawud — The Book of Lost and Found Items — Hadith No: 1708
Translation
The above mentioned tradition has also been transmitted by Yahya bin Sa’id and Rabi’ah through the chain of narrators mentioned by Qutaibah to the same effect. This version adds; if its seeker comes, and recognizes its container and its number, then give it to him. Hammad also narrated it from `Ubaid Allah bin `Umar from `Amr bin Shu’aib, from his father, from his grandfather, from the Prophet (SWAS) something similar. Abu Dawud said :This addition made by Hammad bin Salamah bin Kuhail, Yahya bin Sa’id, `Ubaid Allah bin `Umar and Rabi’ah; “if its owner comes and recognizes its container, and its string,” is not guarded. The version narrated by Uqbah bin Suwaid on the authority of his father from the Prophet (SWAS) has also the words : “make it known for a year”. The version of `Umar bin al-Khattab has also been transmitted from the Prophet (SWAS). This version has : “Make it known for a year”