Musannaf Ibn Abi Shayba 37:157

Abu al-Ahwas narrated to us, from al-A'mash, from Zayd ibn Wahb, from Abdullah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "There will be after me favoritism and matters that you will disapprove of." He said: I said, "O Messenger of Allah, what do you command those of us who reach that time to do?" He said: "You shall fulfill the right that is upon you, and you shall ask Allah for that which is yours."