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It is related in munqati’ form on the authority of Ibn ‘Abbas that the Prophet (ﷺ) said, “No legacy is to be left to an heir unless the other heirs are agreeable.” This is the wording in al-Masabih, but in Daraqutni’s version he said, “A legacy to an heir is not allowable unless the other heirs are agreeable.”
Source: sunnah.com
Other translations
Arabic
وَيُرْوَى عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «لَا وَصِيَّةَ لِوَارِثٍ إِلَّا أَنْ يَشَاءَ الْوَرَثَةُ» مُنْقَطِعٌ هَذَا لَفْظُ الْمَصَابِيحِ. وَفِي رِوَايَةِ الدَّارَقُطْنِيِّ: قَالَ: «لَا تَجُوزُ وَصِيَّةٌ لِوَارِثٍ إِلَّا أَنْ يَشَاء الْوَرَثَة»
sunnah.com