From Sahih Bukhari (Hadith 4590):
Narrated Sa`id bin Jubair:The people of Kufa disagreed (disputed) about the above Verse. So I went to Ibn `Abbas and asked him about it. He said, "This Verse:-- "And whoever kills a believer intentionally, his recompense is Hell." was revealed last of all (concerning premeditated murder) and nothing abrogated it
Reference: Bukhari 4590