waheeds

You may through this plugin to change your font in your arabic Web site using a modern fonts Devina Web Font Service
A few notes about the sections above:
<ul>
<li>with out change any thing or write code in theme</li>
<li>just choose font and save option</li>
<li>fonts are hosted by maxcdn and files will dont lose or be offline</li>
<li>you can preview font after select</li>
<li>tetsed up to wordpress 4.1</li>
</ul>

RH Devnia Webfonts

this plugin is change your body font with devnia web fonts service if yout site was in arabic language.

Brighten up your blog with Web fonts from google. Take a look at the <a href="https://wordpress.org/extend/plugins/wp-web-fonts/screenshots/" rel="ugc">screenshots area</a> area to give you an idea how easy it is. 
Search hundreds of web font families for example on http://www.google.com/webfonts, then add the one you like to your Blog!

WP Web Fonts

Brighten up your blog with Web fonts from google. Take a look at the screenshots area area to give you an idea how easy it is.

RH Devnia Webfonts vs WP Web Fonts