[XeTeX] huge front of non latin

[houda araj]

Hello,

When I put HUGE in front of 
\HUGE{این اولین نمایه این متن است که برای امتحان آورده شده است} .
xelatex does not recognize it. 
What would someone do if he has to write in different size ?
line1 - HUGE
line2 - Tiny
Line3- normal

Thanks
 		 	   		  
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