The people of Kufa differed as regards the killing of a believer so I entered upon Ibn ʿAbbas (and asked him) about that. Ibn ʿAbbas said, "The Verse (in Surat-An-Nisa', 4:93) was the last thing revealed in this respect and nothing cancelled its validity."
نَزَلَتْ فِي آخِرِ مَا نَزَلَ وَلَمْ يَنْسَخْهَا شَىْءٌ