Mukhtasar Muslim

Sayyiduna Abu Dharr (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said to me: "What will you do when there will be such rulers over you who will delay the prayer till its last time, or he said: who will destroy the prayer from its proper time?" I said, "What do you command me to do?" He (peace and blessings be upon him) said: "Perform the prayer at its (proper) time, then if you pray with them as well, it will be a voluntary prayer for you."