Sunan Ibn Majah 2510
سنن ابن ماجه#2510SahihIt was narrated from Ibn`Abbas that the Messenger of Allah (ﷺ) said:“One fifth is due on buried treasure.”
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Zubair Ali ZaiSahih
In-book reference: 18:9