Musannaf Ibn Abi Shayba 36:145

Ubayd Allah ibn Musa narrated to us, he said: Isra'il informed us, from Abu Ishaq, from Harithah ibn Mudarrib, from Ali, who said: When we arrived in Medina and consumed its fruits, we found them disagreeable and were afflicted with fever. The Messenger of Allah (peace and blessings of Allah be upon him) was inquiring about Badr. He said: When news reached us that the polytheists had approached, the Messenger of Allah (peace and blessings of Allah be upon him) marched toward Badr, and Badr is a well. We reached it before the polytheists, and we found two men there: a man from Quraysh and a freedman of Uqbah ibn Abi Mu'ayt. As for the Qurayshi, he escaped, and as for the freedman, we captured him. We began saying to him, "How many are the people?" He would say, "They are, by Allah, many in number and severe in might." Whenever he said that, the Muslims would beat him until they brought him to the Messenger of Allah (peace and blessings of Allah be upon him). He said to him, "How many are the people?" He said, "They are, by Allah, many in number and severe in might." The Prophet (peace and blessings of Allah be upon him) strove to get him to tell them how many they were, but he refused. Then the Messenger of Allah (peace and blessings of Allah be upon him) asked him, "How many do they slaughter [for food]?" He said, "Ten every day." The Messenger of Allah (peace and blessings of Allah be upon him) said, "The people are a thousand; every camel is for a hundred and their followers." Then, during the night, a light rain fell upon us, so we went under the trees and the rocky shelters to take cover from the rain. He said: The Messenger of Allah (peace and blessings of Allah be upon him) spent the night calling upon his Lord. When dawn broke, he called out, "Prayer, servants of Allah!" The people came from under the trees and the rocky shelters, and the Messenger of Allah (peace and blessings of Allah be upon him) led us in prayer and encouraged us to fight. Then he said, "The gathering of Quraysh is by this red slope of the mountain." When the people drew near to us and we lined up against them, there was a man among them on a red camel moving among the people. The Messenger of Allah (peace and blessings of Allah be upon him) said, "O Ali, call Hamza for me"—and he was the closest of them to the polytheists—"and ask him who the man on the red camel is and what he is saying to them." Then the Messenger of Allah (peace and blessings of Allah be upon him) said to them, "If there is anyone among the people [who can give advice], it is likely the man on the red camel." Hamza came and said, "It is Utbah ibn Rabi'ah, and he is forbidding the fighting and saying to them: 'O my people, I see a people who are desperate for death; you will not reach them while there is still good in you. O my people, place the blame on my head and say Utbah is a coward, and you know that I am not the greatest coward among you.'" Abu Jahl heard this and said, "You are saying this? If anyone else had said this, I would have bitten his [finger/nose]. Your lungs and your insides have been filled with fear." Utbah said, "Are you accusing me, you [insult]? You will know today which of us is the coward." He said: So Utbah, his brother Shaybah, and his son al-Walid stepped forward out of pride and said, "Who will duel?" A group of six young men from the Ansar went out. Utbah said, "We do not want these, but let those from our cousins, from the Banu Abd al-Muttalib, duel us." He said: The Messenger of Allah (peace and blessings of Allah be upon him) said, "Stand up, O Ali; stand up, O Hamza; stand up, O Ubaydah ibn al-Harith." Allah killed Utbah ibn Rabi'ah, Shaybah ibn Rabi'ah, and al-Walid ibn Utbah, and Ubaydah ibn al-Harith was wounded. We killed seventy of them and took seventy captive. He said: A short man from the Ansar came with al-Abbas as a captive. Al-Abbas said, "By Allah, this man did not capture me; I was captured by a man with a receding hairline, one of the most handsome-faced of people, on a piebald horse, whom I do not see among the people." The Ansari said, "I captured him, O Messenger of Allah." He said to him, "Be silent, for Allah has aided you with a noble angel." Ali said: From the Banu Abd al-Muttalib, al-Abbas, Aqil, and Nawfal ibn al-Harith were captured.