Sahih al-Bukhari Book 87, Hadith 3

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.

Previous Hadith

Allah's Messenger (ﷺ) said, "A faithful believer remains at liberty regarding his religion unless he kills somebody unlawfully."

Sahih al-Bukhari Book 87, Hadith 2
Next Hadith

The Prophet (ﷺ) said, "The first cases to be decided among the people (on the Day of Resurrection) will be those of blood-shed."

Sahih al-Bukhari Book 87, Hadith 4