"The Messenger of Allah ﷺ asked me: 'How will you act, Abu Dharr, when you are under rulers who kill prayer or delay it (beyond its proper time) ?' I said: 'Messenger of Allah, what do you command me ?' He replied: 'Offer the prayer at its proper time, and if you say it along with them, say it, for it will be a supererogatory prayer for you.'" (Using translation from Abū Dāʾūd 431)   

قَالَ لِي رَسُولُ اللهِ ﷺ كَيْفَ أَنْتَ إِذَا كَانَ عَلَيْكَ أُمَرَاءُ يُؤَخِّرُونَ الصَّلَاةَ عَنْ وَقْتِهَا؟ أَوْ قَالَ يُمِيتُونَ الصَّلَاةَ عَنْ وَقْتِهَا قَالَ قُلْتُ فَمَا تَأْمُرُنِي؟ قَالَ صَلِّ الصَّلَاةَ لِوَقْتِهَا فَإِنْ أَدْرَكْتَهَا مَعَهُمْ فَصَلِّ؛ فَإِنَّهَا لَكَ نَافِلَةٌ  

Amr ibn Maymun al-Awdi said: Mu'adh ibn Jabal, the Messenger of the Messenger of Allah ﷺ 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 Messenger of Allah ﷺ 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, Messenger 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. (Using translation from Abū Dāʾūd 432)   

قَدِمَ عَلَيْنَا مُعَاذُ بْنُ جَبَلٍ ؓ الْيَمَنَ رَسُولَ رَسُولِ اللهِ ﷺ إِلَيْنَا قَالَ فَسَمِعْتُ تَكْبِيرَهُ مَعَ الْفَجْرِ بِرَجُلٍ أَجَشِّ الصَّوْتِ قَالَ قَالَ فَأَلْقَيْتُ عَلَيْهِ مَحَبَّتِي فَمَا فَارَقْتُهُ حَتَّى دَفَنْتُهُ بِالشَّامِ مَيِّتًا ثُمَّ نَظَرْتُ إِلَى أَفْقَهِ النَّاسِ بَعْدَهُ فَأَتَيْتُ ابْنَ مَسْعُودٍ فَلَزِمْتُهُ حَتَّى مَاتَ فَقَالَ قَالَ لِي رَسُولُ اللهِ ﷺ كَيْفَ بِكُمْ إِذَا أَتَتْ عَلَيْكُمْ أُمَرَاءُ يُصَلُّونَ الصَّلَاةَ بِغَيْرِ وَقْتِهَا؟ قُلْتُ فَمَا تَأْمُرُنِي إِنْ أَدْرَكَنِي ذَلِكَ يَا رَسُولَ اللهِ؟ قَالَ صَلِّ الصَّلَاةَ لِمِيقَاتِهَا وَاجْعَلْ صَلَاتَكَ مَعَهُمْ سُبْحَةً