3:12a behold, I will do what you have asked.

So listen! I will do that!
-or-
So I will indeed do as you have asked.
-or-
So I will certainly fulfill your request.

3:12b I will give you a wise and discerning heart,

Look!/Listen! I will give you (sing) wisdom and understanding.
-or-
I will make you wise and understanding.
-or-
You will be wise and able to make good decisions.

3:12c so that there has never been nor will ever be another like you.

No one who lived before you (sing) and no one who will live after you will be your equal.
-or-
You will be the wisest person who has ever lived. Nor will there ever be/live anyone as wise as you.
-or-
No one before you and no one after you will be wiser than you.

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