Why is Classical Arabic studied in Iranian schools?

In Iran, the study of Classical Arabic is emphasized in schools primarily due to its status as the language of the Qurʾān and its role as the predominant language of learned religious discourse.1

Following the Islamic conquest of Persia in the 7th century, Arabic became the sacred language of Islam and exerted a profound influence on the region. Over time, Persian adopted a significant number of Arabic loanwords—estimated at one-third or more of its lexicon—as well as various grammatical constructions. Because of this deep historical and religious integration, Arabic remains central to understanding Islamic texts and traditions within the Iranian educational system.21