"The Messenger of Allah ﷺ judged that the son is to suffer retaliation for [killing] his father, but the father is not to suffer retaliation for [killing] his son."  

حَضَرْتُ رَسُولَ اللَّهِ ﷺ يُقِيدُ الأَبَ مِنِ ابْنِهِ وَلاَ يُقِيدُ الاِبْنَ مِنْ أَبِيهِ  

that the Messenger of Allah ﷺ said: "The father does not suffer retaliation for [killing] the son."  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ لاَ يُقَادُ الْوَالِدُ بِالْوَلَدِ  

that the Prophet ﷺ said: 'The Hudud are not carried in the Masjid, and the father is not killed for the son."  

عَنِ النَّبِيِّ ﷺ قَالَ لاَ تُقَامُ الْحُدُودُ فِي الْمَسَاجِدِ وَلاَ يُقْتَلُ الْوَالِدُ بِالْوَلَدِ