“The Prophet ﷺ addressed them when he was on his camel. His camel was chewing its cud and its saliva was dripping between my shoulders. He said: 'Allah (SWT) has allocated for each heir his share of the inheritance, so it is not permissible (to make) a bequest for an heir. The child belong to the bed and the adulterer gets the stone. Whoever claims to belong to someone other than his father, or (a freed slave) who claims that his Wala is for other than his Mavali, upon him will be the curse of Allah, the angels and all the people, and no charge nor equitable exchange will be accepted from him.” Or he said: “No equitable exchange nor change.” (Using translation from Ibn Mājah 2712)
أَنَّ النَّبِيَّ ﷺ خَطَبَهُمْعَلَى رَاحِلَتِهِ وَإِنَّ رَاحِلَتَهُ لَتَقْصَعُ بِجِرَّتِهَا وَإِنَّ لُعَابَهَا يَسِيلُ بَيْنَ كَتِفَيَّ فَقَالَ إِنَّ اللهَ قَدْ قَسَمَ لِكُلِّ إِنْسَانٍ نَصِيبَهُ مِنَ الْمِيرَاثِ فَلَا تَجُوزُ وَصِيَّةٌ لِوَارِثٍ الْوَلَدُ لِلْفِرَاشِ وَلِلْعَاهِرِ الْحَجَرُ أَلَا وَمَنْ ادَّعَى إِلَى غَيْرِ أَبِيهِ أَوْ تَوَلَّى غَيْرَ مَوَالِيهِ فَعَلَيْهِ لَعْنَةُ اللهِ وَالْمَلَائِكَةِ وَالنَّاسِ أَجْمَعِينَ لَا يَقْبَلُ اللهُ مِنْهُ صَرْفًا وَلَا عَدْلًا أَوْ عَدْلًا وَلَا صَرْفًا