What famous saying does this rebus mean?

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Which is Odd One Out and why?

4377

3954

9862

8454

9831

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Look at the picture and find out which square is not linked with any of the other squares.

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

What is wrong in the below Picture?

In which direction should the missing arrow point?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?