بُلُوغُ الْمَرَامِ
Bulugh al-Maram 962
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وَرَوَاهُ اَلدَّارَقُطْنِيُّ مِنْ حَدِيثِ اِبْنِ عَبَّاسٍ - رَضِيَ اَللَّهُ عَنْهُمَا- , وَزَادَ فِي آخِرِهِ : { إِلَّا أَنْ يَشَاءَ اَلْوَرَثَةُ } وَإِسْنَادُهُ حَسَنٌ [1] .
ad-Daraqutni reported the aforesaid Hadith from the narration of Ibn 'Abbas (RA); and he added in its end: "unless the other heirs wish so." [Its chain of narrators is Hasan (good)].
Sunnah.com reference: Book 7, Hadith 226