Musnad Ahmad 1153:2390

I found in my father’s book: Sa’id ibn Muhammad al-Warraq narrated to us, he said: Wa’il ibn Dawud narrated to us, from al-Bahiy, from ‘Aishah, she said: "The Messenger of Allah, peace and blessings of Allah be upon him, never sent Zayd ibn Harithah in an army at all, but that he appointed him over them. And had he remained after him, he would have appointed him as his successor."