Al-Kāfi
Hadith 44- مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ إِسْمَاعِيلَ عَنْ مُحَمَّدِ بْنِ الْفُضَيْلِ عَنْ أَبِي الصَّبَّاحِ الْكِنَانِيِّ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ سَأَلْتُهُ عَنِ الْوَصِيَّةِ فَقَالَ هِيَ حَقٌّ عَلَى كُلِّ مُسْلِمٍ.
4. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn ’Isma‘il from Muhammad ibn af-Fudayf from abu af-Sabbah af-Kinaniy who has narrated the following: “I once asked abu ‘Abd Allah (a.s.), about the will. He (the Imam) said, ‘It is a right on every Muslim.’”