Abil Shuraih Al-Khaza'i (RAA) narrated that The Messenger of Allah (ﷺ) said:

“If the relative of one of you is killed after my speech, his family has one of two choices: ‘Either they take his Diyah or kill the killer.” Related by Abu Dawud and An-Nasa’i.

وَعَنْ أَبِي [1]‏ شُرَيْحٍ اَلْخُزَاعِيِّ قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ فَمَنْ قُتِلَ لَهُ قَتِيلٌ بَعْدَ مَقَالَتِي هَذِهِ, فَأَهْلُهُ بَيْنَ خِيَرَتَيْنِ: إِمَّا أَنْ يَأْخُذُوا اَلْعَقْلِ.‏ أَوْ يَقْتُلُوا } أَخْرَجَهُ أَبُو دَاوُدَ, وَالنَّسَائِيُّ [2]‏ .‏