رَوَى اَلسَّكُونِيُّ عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ عَنْ أَبِيهِ عَنْ آبَائِهِ عَلَيْهِمُ اَلسَّلاَمُ قَالَ قَالَ أَمِيرُ اَلْمُؤْمِنِينَ عَلَيْهِ اَلسَّلاَمُ: "اَلْوَصِيَّةُ بِالْخُمُسِ لِأَنَّ اَللَّهَ عَزَّ وَ جَلَّ رَضِيَ لِنَفْسِهِ بِالْخُمُسِ " وَ قَالَ "اَلْخُمُسُ اِقْتِصَادٌ وَ اَلرُّبُعُ جَهْدٌ وَ اَلثُّلُثُ حَيْفٌ".
Al-Sakuni narrated from Imam Jafar ibn Muhammad Al-Sadiq (a.s) from his father, Imam Muhammad ibn Ali Al-Baqir (a.s), who said that the Commander of the Faithful (a.s) said: "Bequeathing one-fifth (khums) is recommended because Allah (swt), the Mighty and Majestic, has chosen one-fifth for Himself." Imam (a.s) also said: "One-fifth is moderation, one-fourth is exertion, and one-third is injustice."