I heard the Messenger of Allah ﷺ say: Allah has appointed for everyone who has a right what is due to him, and no bequest must be made to an heir. (Using translation from Abū Dāʾūd 2870)
قَالَ رَسُولُ اللهِ ﷺ «إِنَّ اللهَ قَدْ أَعْطَى كُلَّ ذِي حَقٍّ حَقَّهُ فَلَا وَصِيَّةَ لِوَارِثٍ»