Musnad Ahmad 529:8

Hisham ibn Sa'id narrated to us, Hasan ibn Ayyub al-Hadrami narrated to us, 'Abdullah ibn Nasih al-Hadrami narrated to me—and he had met Abu Bakr, 'Umar, and those below them—from 'Utbah ibn 'Abd al-Sulami: That the Prophet, peace and blessings of Allah be upon him, said to his companions: "Stand up and fight." They said: "Yes, O Messenger of Allah, and we will not say as the Children of Israel said to Moses: 'Go, you and your Lord, and fight; indeed, we are sitting right here.' Rather, go, you and your Lord, O Muhammad, and fight, and we are with you, fighting."