What did Jesus tell the church in Sardis to do?

ANSWER

He told them to wake up!

Revelation 2 :

(1) "To the angel of the church in Sardis write:
These are the words of him who holds the seven spirits of God and the seven stars. I know your deeds; you have a reputation of being alive, but you are dead. (2) Wake up! Strengthen what remains and is about to die, for I have found your deeds unfinished in the sight of my God. (3) Remember, therefore, what you have received and heard; hold it fast, and repent. But if you do not wake up, I will come like a thief, and you will not know at what time I will come to you."
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