Musnad Abu Ya'la al-Mawsili 149:24

'Uthman ibn Abi Shaybah narrated to us, 'Abdullah ibn Idris narrated to us, from Hizam ibn Hisham, who said: My father informed me, from 'Aishah, who said: "I truly saw the Messenger of Allah (may Allah bless him and grant him peace) become angry regarding the affair of Banu Ka'b with an anger the likes of which I had not seen him angry with for a long time. He said: 'May Allah not help me if I do not help Banu Ka'b.' She said: And he said to me: 'Tell Abu Bakr and 'Umar to prepare for this expedition.' She said: So they came to 'Aishah and said: 'Where does the Messenger of Allah (may Allah bless him and grant him peace) intend to go?' She said: 'I truly saw him become angry regarding the affair of Banu Ka'b with an anger the likes of which I had not seen him angry with for a long time of the era.'"