Musnad Ahmad 26:516

Mu'ammal narrated to us, Sufyan narrated to us, al-A'mash narrated to us, from Zayd ibn Wahb, from Abdullah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There will be tribulations and matters that you will disapprove of." They said: "O Messenger of Allah, what do you command us?" He said: "You shall fulfill the right that is upon you, and you shall ask Allah, the Almighty and Majestic, for that which is yours."