“Thus have We sent down an Arabic Quran and explained therein some of the threats, that they may safeguard themselves against evil, or that it may serve as a reminder to (warn) them”
Imam Sadiq (as) said, “Or that it may serve as a reminder to (warn) them.” This (verse) refers to what will happen between the Qaem (as) and Sufyani. (Tafseer Ayyashi volume 2 page 65)