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On this Day, when unbelievers will be overwhelmed by a grievous regret, believers will be joyful and exuberant:

... On the Day when Allah will not disgrace the Prophet and those who had faith along with him..

That is because "Allah will certainly help the Messenger and those who believe both in the life of the world and on the Day the witnesses appear."

The sole king of that Day is Allah, for He is the only One Who can command. The related verses read: 
There will be but one Great Blast, and then their eyes will open. They will say: "Alas for us! This is the Day of Reckoning!" This is the Day of Decision you used to deny. 

Woe that Day to the deniers, those who deny the Day of Reckoning. No one denies it except for every evil aggressor.

"An insincere and evil friend Lanatullahi alel khadibin, is more to be feared than a wild beast; a wild beast may wound your body, but an evil friend will wound your mind. " ~ Buddha