Al-Kāfi

Hadith 1974
zakat
5ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ حَمَّادٍ عَنْ حَرِيزٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلام) عَنِ الذَّهَبِ كَمْ فِيهِ مِنَ الزَّكَاةِ فَقَالَ إِذَا بَلَغَ قِيمَتُهُ مِائَتَيْ دِرْهَمٍ فَعَلَيْهِ الزَّكَاةُ.
5. Ali ibn Ibrahim has narrated from his father from Hammad, from Hariz from Muhammad ibn Muslim who has said the following: “I once asked abu ‘Abd Allah (a.s.), about gold and the amount of its Zakat. He (the Imam) said, ‘Once its value amounts up to two hundred dirham then Zakat is payable.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī