Sa'id bin al-Musayyab (may Allah have mercy on him) said concerning "And when relatives, orphans and the needy are present at the division, provide for them from it" [Surah al-Nisa': 8]: The (verses of the) fixed shares abrogated it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوصايا / 12559