The Sufficient (Vol 7) · Hadith 201 (#Ḥadīth #4)

4- مُحَمَّدُ بْنُ يَحْيَى رَفَعَهُ عَنْهُمْ (عَلَيْهِم السَّلام) قَالَ قَالَ مَنْ أَوْصَى بِالثُّلُثِ احْتُسِبَ لَهُ مِنْ زَكَاتِهِ.

4. 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.’”

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).