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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
abudawud:3086 – Yaḥyá b. Ayyūb > ʿAbbād b. al-ʿAwwām > Hishām > al-Ḥasan

Al hasan said “Rikaz means treasure buried in pre Islamic times.”  

أبو داود:٣٠٨٦ – حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ حَدَّثَنَا عَبَّادُ بْنُ الْعَوَّامِ عَنْ هِشَامٍ عَنِ الْحَسَنِ قَالَ

الرِّكَازُ الْكَنْزُ الْعَادِيُّ