Muwatta Malik #1130
Fara'id
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ بَلَغَهُ أَنَّ مُعَاوِيَةَ بْنَ أَبِي سُفْيَانَ، كَتَبَ إِلَى زَيْدِ بْنِ ثَابِتٍ يَسْأَلُهُ عَنِ الْجَدِّ، فَكَتَبَ إِلَيْهِ زَيْدُ بْنُ ثَابِتٍ إِنَّكَ كَتَبْتَ إِلَىَّ تَسْأَلُنِي عَنِ الْجَدِّ، وَاللَّهُ، أَعْلَمُ وَذَلِكَ مِمَّا لَمْ يَكُنْ يَقْضِي فِيهِ إِلاَّ الأُمَرَاءُ - يَعْنِي الْخُلَفَاءَ - وَقَدْ حَضَرْتُ الْخَلِيفَتَيْنِ قَبْلَكَ يُعْطِيَانِهِ النِّصْفَ مَعَ الأَخِ الْوَاحِدِ وَالثُّلُثَ مَعَ الاِثْنَيْنِ فَإِنْ كَثُرَتِ الإِخْوَةُ لَمْ يُنَقِّصُوهُ مِنَ الثُّلُثِ .
Yahya related to me from Malik from Yahya ibn Said that he had
heard that Muawiya ibn Abi Sufyan wrote to Zayd ibn Thabit asking him
about the grandfather. Zayd ibn Thabit wrote to him, "You have written
to me asking me about the grandfather. Allah knows best. That is part
of what is only determined by the amirs, i.e. the khalifs. I was
present with two khalifs before you who gave the grandfather a half
with one sibling, and a third with two. If there were more siblings,
they did not decrease his third."
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About Muwatta Malik
This hadith is #1130 from Muwatta Malik, in the Book of Fara'id.