Abu Hurairah (RAA) narrated that The Messenger of Allah (ﷺ) said:

“One fifth is compulsory to be paid (as Zakah) on buried Treasure.” Agreed upon.

وَعَنْ أَبِي هُرَيْرَةَ ‏- رضى الله عنه ‏- { أَنَّ رَسُولَ اَللَّهِ ‏- صلى الله عليه وسلم ‏-قَالَ:

وَفِي اَلرِّكَازِ: اَلْخُمُسُ

.‏ } مُتَّفَقٌ عَلَيْه ِ [1]‏ .‏