Sahih al-Bukhari 6863

Arabic

حَدَّثَنِي أَحْمَدُ بْنُ يَعْقُوبَ، حَدَّثَنَا إِسْحَاقُ، سَمِعْتُ أَبِي يُحَدِّثُ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، قَالَ إِنَّ مِنْ وَرْطَاتِ الأُمُورِ الَّتِي لاَ مَخْرَجَ لِمَنْ أَوْقَعَ نَفْسَهُ فِيهَا، سَفْكَ الدَّمِ الْحَرَامِ بِغَيْرِ حِلِّهِ‏.‏

English translation

Narrated `Abdullah bin `Umar:One of the evil deeds with bad consequence from which there is no escape for the one who is involved in it is to kill someone unlawfully

Reference: Sahih al-Bukhari 6863, Book of Blood Money (Ad-Diyat). English translation by Dr. Muhammad Muhsin Khan.