The Messenger of Allah ﷺ said to me: O Abu Dharr, you would soon find after me rulers who would make their prayers dead. You should say prayer at its prescribed time. If you say prayer at its prescribed time that would be a supererogatory prayer for you, otherwise you saved your prayer.
لِي رَسُولُ اللَّهِ ﷺ يَا أَبَا ذَرٍّ إِنَّهُ سَيَكُونُ بَعْدِي أُمَرَاءُ يُمِيتُونَ الصَّلاَةَ فَصَلِّ الصَّلاَةَ لِوَقْتِهَا فَإِنْ صَلَّيْتَ لِوَقْتِهَا كَانَتْ لَكَ نَافِلَةً وَإِلاَّ كُنْتَ قَدْ أَحْرَزْتَ صَلاَتَكَ