Al-Kāfi - The Book of Zakat

ِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ عَلِيِّ بْنِ حَسَّانَ عَنْ ٠ُوسَى بْنِ بَكْ��ٍ عَنْ أَبِي الْحَسَنِ ٠ُوسَى (عَلَيْهِ السَّلاَ٠) قَالَ حَصِّنُوا أَ٠5.

A number of our people have narrated from Sahl ibn Ziyad from Ali ibn Hassan from Musa ibn Bakr who has said the following: “Abu al-Hassan, Musa (a.s.), has said, ‘Fortify your belongings by paying zakat.’”