The written Arabic materials for Arabic (Fusha).

Beside the text books which Arabic student should study from, here are two wonderful books which were written for non-native Arabic speakers: 

The first book is قصص النبيين

https://ia801400.us.archive.org/26/items/WAQ32592/32592.pdf

The second book is: القراءة الراشدة

https://ia801400.us.archive.org/34/items/WAQ108911/108911.pdf