Not graded
Bulugh al-Maram 957
وَعَنْ أَبِي قِلَابَةَ , عَنْ أَنَسٍ قَالَ : قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ أَفْرَضُكُمْ زَيْدُ بْنُ ثَابِتٍ } أَخْرَجَهُ أَحْمَدُ , وَالْأَرْبَعَةُ سِوَى أَبِي دَاوُدَ , وَصَحَّحَهُ اَلتِّرْمِذِيُّ , وَابْنُ حِبَّانَ , وَالْحَاكِمُ , وَأُعِلَّ بِالْإِرْسَالِ 1 .
1 - ضعيف . وتفصيل ذلك " بالأصل ".
Narrated Abu Qilabah on the authority of Anas (RA):
Allah's Messenger (ﷺ) said: "The most versed in the rules of inheritance among you is Zaid bin Thabit." [Reported by Ahmad and al-Arba'a except Abu Dawud. at-Tirmidhi, Ibn Hibban and al-Hakim graded it Sahih (authentic). However, it was considered defective due to being Mursal (missing link in the chain after the Tabi'i)].
Cited in Bulugh al-Maram (No. 957).