وَ كَتَبَ مُحَمَّدُ بْنُ اَلْحَسَنِ اَلصَّفَّارُ رَضِيَ اَللَّهُ عَنْهُ إِلَى أَبِي مُحَمَّدٍ اَلْحَسَنِ بْنِ عَلِيٍّ عَلَيْهِ اَلسَّلاَمُ: رَجُلٌ أَوْصَى بِثُلُثِ مَالِهِ فِي مَوَالِيهِ وَ مَوْلَيَاتِهِ اَلذَّكَرُ وَ اَلْأُنْثَى فِيهِ سَوَاءٌ أَوْ "لِلذَّكَرِ مِثْلُ حَظِّ اَلْأُنْثَيَيْنِ" مِنَ اَلْوَصِيَّةِ فَوَقَّعَ عَلَيْهِ اَلسَّلاَمُ "جَائِزٌ لِلْمَيِّتِ مَا أَوْصَى بِهِ عَلَى مَا أَوْصَى بِهِ إِنْ شَاءَ اَللَّهُ تَعَالَى ".
Muhammad bin Al-Hasan Al-Saffar, may Allah (swt) be pleased with him, wrote to Abu Muhammad Imam Hasan ibn Ali Al-Askari (a.s) regarding a man who bequeathed one-third of his wealth to his male and female servants, either equally or with the instruction that "the male should receive the share of two females" from the bequest. Abu Muhammad (a.s) replied: "It is permissible for the deceased to bequeath according to what he specified, if Allah (swt) the Exalted wills."