You could try a program like [gnome-specimen](http://uwstopia.nl/geek/projects/gnome-specimen) which shows the text you choose rendered in the different fonts. If you en ter text with persian glyphs you should be able to locate a font that handles them:

    ![gnome-specimen screenshot][1]


<sub>Image shamelessly stolen from @derobert's [answer][2].</sub>


 [1]: https://i.sstatic.net/6cXoV.png
 [2]: http://unix.stackexchange.com/a/120803/22222