Abu Dawud Book 2, Hadith Number 432.

Narated By Abdullah ibn Mas’ud : Amr ibn Maymun al-Awdi said: Mu’adh ibn Jabal, the Messenger of the Apostle of Allah (PBUH) came to us in Yemen, I heard his takbir (utterance of AllahuAkbar) in the dawn prayer. He was a man with loud voice. I began to love him. I did depart from him until I buried him dead in Syria (i.e. until his death).

Then I searched for a person who had deep understanding in religion amongst the people after him. So I came to Ibn Mas’ud and remained in his company until his death. He (Ibn Mas’ud) said: The Apostle of Allah (PBUH) said to me: How will you act when you are ruled by rulers who say prayer beyond its proper time? I said: What do you command me, Apostle of Allah, if I witness such a time? He replied: Offer the prayer at its proper time and also say your prayer along with them as a supererogatory prayer.