Currently Sublime Text 3 is not supporting bidirectional languages like Arabic, Hebrew etc.. Using this plugin you can view bidirectional texts.
Please note, I don't know Arabic or Hebrew. I have checked the results by pattern matching. Its a starting point.
Clone it into Sublime Package directory.
Set Font face to any Arabic supporting font (Arial) in user settings.
Open file. Enter text Tools > Bidirectional text (ctrl+b)
Tools > Bidirectional text Ctrl + B Right click > Bidirectional text
Post an issue here on Github. https://github.com/praveenvijayan/Sublime-Text-2-BIDI/issues
http://www.decodize.com/html/sublime-text-2-bidirectional-language-support-plugin/
Follow for updates : @praveen_vijaya
https://github.com/MeirKriheli/python-bidi
https://github.com/mpcabd/python-arabic-reshaper