Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ibnmajah:2514ʿUthmān b. Abū Shaybah > ʿAlī b. Ẓabyān > ʿUbaydullāh > Nāfiʿ > Ibn ʿUmar

“The Mudabbar is part of the one third of the estate.”  

ابن ماجة:٢٥١٤حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا عَلِيُّ بْنُ ظَبْيَانَ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ

أَنَّ النَّبِيَّ ﷺ قَالَ الْمُدَبَّرُ مِنَ الثُّلُثِ قَالَ ابْنُ مَاجَهْ سَمِعْتُ عُثْمَانَ يَعْنِي ابْنَ أَبِي شَيْبَةَ يَقُولُ هَذَا خَطَأٌ يَعْنِي حَدِيثَ الْمُدَبَّرُ مِنَ الثُّلُثِ قَالَ أَبُو عَبْدِ اللَّهِ لَيْسَ لَهُ أَصْلٌ