Abdullah bin Abi Bakr bin Hazm and Salih bin Abi Umamah bin Sahl bin Hunayf (may Allah have mercy on them both) say: When the Messenger of Allah (peace and blessings be upon him) had finished with Badr, he sent Zayd bin Harithah and Abdullah bin Rawahah (may Allah be pleased with them both) to give the good news to the people of Madinah. When this news reached Ka'b bin al-Ashraf, he said: "Woe to you! Is this news true? These kings of the Arabs and chiefs of the people, meaning Quraysh, have been killed?" Then he went towards Makkah weeping over the slain of Quraysh, and he was inciting them against the Messenger of Allah (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18630