It is narrated from Thabit al-Bunani that one day in a battle Sayyiduna Ikrimah bin Abi Jahl (may Allah be pleased with him) began to go forward on foot. Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) said: "Do not do this; your being killed would be grievous for the Muslims." He said: "Let me go, O Khalid (may Allah be pleased with him)! You are ahead of me in having stood by the Prophet (peace and blessings be upon him), whereas my father and I were the greatest enemies of the Messenger of Allah (peace and blessings be upon him)." He went forward and was martyred.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17920