مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3616
Musnad of Abdullah bin Mas'ood
It was narrated that 'Abdullah (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: “There will be rulers over you and you will see selfishness (i.e., they will not give you your dues)." They said: O Messenger of Allah, what should those of us who live to see that do? He said: “Pay your dues and ask Allah for that which is due to you.”
Musnad Ahmad 3640Its isnad is saheeh, al-Bukhari (7052) and Mustim (1843)]