Al-Kāfi
Hadith 55- مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ مَحْبُوبٍ عَنِ الْعَلاءِ بْنِ رَزِينٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ قَالَ قَالَ أَبُو جَعْفَرٍ (عَلَيْهِ السَّلام) الْوَصِيَّةُ حَقٌّ وَقَدْ أَوْصَى رَسُولُ اللهِ (صَلَّى اللهُ عَلَيْهِ وَآلِه) فَيَنْبَغِي لِلْمُسْلِمِ أَنْ يُوصِيَ.
5. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad, from ibn Mahbub from al-‘Ala’ ibn Razin from Muhammad ibn Muslim who has narrated the following: “Abu Ja‘far (a.s.), has said, ‘Making a will is a right that requires compliance. The Messenger of Allah (a.s.), made a will, thus it is proper for a Muslim to make a will.’”