Musnad Ahmad 1153:402

Husayn ibn Muhammad narrated to us, he said: Muslim—meaning Ibn Khalid—narrated to us, from Abd al-Rahman ibn Abi Bakr, he said: Al-Qasim ibn Muhammad informed me, from Aisha, she said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever Allah the Almighty and Majestic puts in charge of any of the affairs of the Muslims, and He intends good for him, He appoints for him a truthful minister; if he forgets, he reminds him, and if he remembers, he assists him."