Al-Kāfi - The Book of Wills

Chapter: Making a Will for the Heir ِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ وَأَحْ٠ِيعاً عَنِ ابْنِ ٠َحْبُوبٍ عَنْ أَبِي وَلادٍ الْحَنَّاطِ قَالَ سَأَلْتُ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلا٠َيِّتِ يُوصِي لِلْوَارِثِ بِشَيْ‏ءٍ قَالَ نَعَ٠ْ أَوْ قَالَ جَائِزٌ لَهُ. 2.

A number of our people have narrated from Sahl ibn Ziyad and Ahmad ibn Muhammad from all from ibn Mahbub from abu Wallad al-Hannat who has narrated the following: “I once asked abu ‘Abd Allah (a.s.), if one can make a will about something for the heirs. He (the Imam) said, ‘Yes,’ or he said that ‘it is permissible.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (23/17))