Translation of the verse 17 from Surah Ta-Ha : Number of verses 135 - - page 313 - Part 16.
"And what is that in your right hand, O Musa (Moses)?"
And what is that in your right hand, O Moses?"
(20:17) And O-Moses, what is this in your right hand?" *11
*11) This question was not asked for the sake of getting any information, for Allah knew that Moses held a staff in his hand. The question was posed with a view to impressing upon him the fact that it was a staff so that he might be mentally prepared to see the miracle which was going to be performed with it.
Source : Ta-Ha Verse 17: And what is that in your right hand, O Moses?"