Hasan al-Basri (may Allah have mercy on him) said: I asked Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him): The verse of concession was revealed concerning you, so what did you do? He said: "I slaughtered a sheep."
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16404