Al-Kāfi - The Book of Wills

َّدُ بْنُ يَحْيَى رَفَعَهُ عَنْهُ٠َنْ أَوْصَى بِالثُّلُثِ احْتُسِبَ لَهُ ٠4. Muhammad ibn Yahya has narrated in a marfu‘ the following: “‘A’immah, ‘Alayhim al-Salam, have said, ‘If one makes a will about one-third of his legacy it is counted as his Zakat.’” رفوع - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (23/95))