Musnad Ahmad 33:50

'Abd al-Razzaq and Ibn Bakr narrated to us, they said: Ibn Jurayj informed us, Abu al-Zubayr informed me that he heard Jabir ibn 'Abd Allah saying: "Ibn Rawahah estimated it at forty thousand wasqs. And he claimed that when Ibn Rawahah gave the Jews the choice, they took the fruit, and upon them was twenty thousand wasqs."