Sirat Ibn Ishaq
“He said, 'O Thabit, what has become of him whose face was like a Chinese mirror in which the virgins of the tribe could see themselves, Ka'b b. Asad?' 'Killed,' he said. 'And what of the prince of the Desert and the Sown, Huyayy b. Akhtab?' 'Killed.' 'And what of our vanguard when we attacked and our rearguard when we fled, 'Azzal b. Samaw'al?' 'Killed.' 'And what of the two assemblies?' meaning B. Ka'b b. Qurayza and B. 'Amr b. Qurayza. 'Killed.' He said, 'Then I ask of you, Thabit, by my claim on you that you join me with my people, for life holds no joy now that they are dead, and I cannot bear to wait another moment to meet my loved ones.'”
Ibn Ishaq's Sirat Rasul Allah (trans. A. Guillaume, "The Life of Muhammad"), Banu Qurayza aftermath — al-Zabir b. Bata's final exchange with Thabit b. Qays, §712.