بُلُوغُ الْمَرَامِ
Bulugh al-Maram 950
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وَعَنِ ابْنِ بُرَيْدَةَ , عَنْ أَبِيهِ ; { أَنَّ اَلنَّبِيَّ - صلى الله عليه وسلم -جَعَلَ لِلْجَدَّةِ اَلسُّدُسَ , إِذَا لَمْ يَكُنْ دُونَهَا أُمٌّ } رَوَاهُ أَبُو دَاوُدَ , وَالنَّسَائِيُّ , وَصَحَّحَهُ اِبْنُ خُزَيْمَةَ , وَابْنُ اَلْجَارُودِ , وَقَوَّاهُ اِبْنُ عَدِيٍّ [1] .
Narrated Ibn Buraidah (RA) on the authority of his father: The Prophet (ﷺ) appointed a sixth to a grandmother if no mother is left to inherit before her. [Reported by Abu Dawud and an-Nasa'i. Ibn Khuzaimah and Ibn al-Jarud graded it Sahih (authentic) and Ibn 'Adi graded it strong].
Sunnah.com reference: Book 7, Hadith 214