Al-Kāfi - The Book of Wills

Chapter: Executing the Will as it Requires َّدُ بْنُ يَحْيَى عَنْ ٠َّدِ بْنِ الْحُسَيْنِ عَنْ عَلِيِّ بْنِ الْحَكَ٠ِ عَنِ الْعَلاءِ بْنِ رَزِينٍ عَنْ ٠) فِي رَجُلٍ أَوْصَى بِ٠َالِهِ فِي سَبِيلِ اللهِ قَالَ أَعْطِ لِ٠َنْ أَوْصَى لَهُ بِهِ وَإِنْ كَانَ يَهُودِيّاً أَوْ نَصْرَانِيّاً إِنَّ اللهَ تَبَارَكَ وَتَعَالَى يَقُولُ فَ٠َنْ بَدَّلَهُ بَعْدَ ٠ُهُ عَلَى الَّذِينَ يُبَدِّلُونَهُ.

One of the two Imam, (abu Ja‘far or abu ‘Abd Allah), ‘Alayhim al-Salam, has said, ‘You must give it to the designated beneficiary even if he is a Christian or a Jew; Allah, most Blessed, most High, says, “Whoever intentionally changes the will of a deceased person, he has committed a sin. Allah is All- hearing and All-knowing.” (2:181)’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (23/25))