question #2 Sahih Muslim 648b, Book 5, Hadith 299 : How can one ensure their prayers are preserved even if leaders fail to observe them properly?

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.