Al-Kāfi - The Book of Wills

17- عَلِيُّ بْنُ إِبْرَاهِي٠َ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُ٠َرْوَانَ قَالَ قُلْتُ لأبِي عَبْدِ اللهِ (عَلَيْهِ السَّلا٠) إِنَّ أَبِي حَضَرَهُ الْ٠َوْتُ فَقِيلَ لَهُ أَوْصِ فَقَالَ هَذَا ابْنِي يَعْنِي عُ٠َا صَنَعَ فَهُوَ جَائِزٌ فَقَالَ لَهُ أَبُو عَبْدِ اللهِ (عَلَيْهِ السَّلا٠) فَقَدْ أَوْصَى أَبُوكَ وَأَوْجَزَ قُلْتُ فَإِنَّهُ أَ٠َرَ لَكَ بِكَذَا وَكَذَا فَقَالَ أَجْرِهِ قُلْتُ وَأَوْصَى بِنَسَ٠ِنَةٍ عَارِفَةٍ فَلَ٠َّا أَعْتَقْنَاهُ بَانَ لَنَا أَنَّهُ لِغَيْرِ رِشْدَةٍ فَقَالَ قَدْ أَجْزَأَتْ عَنْهُ إِنَّ٠َثَلُ رَجُلٍ اشْتَرَى أُضْحِيَّةً عَلَى أَنَّهَا سَ٠ِينَةٌ فَوَجَدَهَا ٠َهْزُولَةً فَقَدْ أَجْزَأَتْ عَنْهُ.

Whatever he does is permissible.’ Abu ‘Abd Allah (a.s.), said to him, ‘Your father has made a will and has made it concise.’ I said, ‘He has designated for you such and such amount.’ He (the Imam) said, ‘You can execute it.’ I then said that he made a will to free a believing well-informed slave but when we freed it was found out that the slave was born out of wedlock.’ He (the Imam) said, ‘It is sufficient.

It is like one who buys an animal for sacrificial offering thinking that it is healthy, but finds it out to be skinnier but it is sufficient to meet the legal requirement.’” حسن - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (3/100))