What is the bes Ruby's book for beginners?

Hi everybody,

This is my first message to this forum.

I'm interested in learning Ruby and would like to know what book you
think I should start with. I've worked as a developer for over 17 years
and as a Java developer for 3 and a half years. However I don't know
anything about Ruby. So I need a book that teaches Ruby from the
scratch.

What book do you advice me reading? I want a book that is good both in
content and easiness of reading and learning.

Sorry if this question has been posted before. I did a quick search on
the forum trying to find a topic like this one but I didn't find it.

Thanks in advance.
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