Thank you for your replies.
I would only add few words?. as I see it
It?s not that God does not know our intention or what we want to say, it does. But is important to prove our obedience and use of logic.
If God says Say, than we should say what was told us to say. Adding Say in front shows that we either don?t understand what was asked from us or we are just repeating things without paying attention to the content.
Even in our everyday live, you will not take same when someone says for example
?In the name of God I will tell only the truth?..?
and
?Say In the name of God I will tell only the truth??
Two sentences are totally different. First one is declaration/intension; second one is just a request directed to someone else, it?s not declaration and its void. Lawyers will take first one as the oath and its binding and second one is not the oath and is not binding.