Abdullah (may Allah be pleased with him) said: I came to Abu Jahl while he lay half dead among the slain. I had an old sword with me. I began striking him with my sword, but it was having no effect. He looked at me and said: "Were you not our little shepherd in Makkah?" Meanwhile his sword fell. I took hold of it and killed him with his own sword. Then I came in haste and informed him (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Did you kill him?" I said: "Yes." He (peace and blessings be upon him) made me swear three oaths, and I swore them. He (peace and blessings be upon him) said: "Come, show him to me." He (peace and blessings be upon him) went out and I showed him to him (peace and blessings be upon him), and he (peace and blessings be upon him) said: "This is the Pharaoh of this Ummah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18014