Mentioning some of Allah's favors upon His righteous servants

Q 9: In his interpretation of verse (31) of Surah Al-Kahf where Allah stated: These! For them will be ‘Adn (Eden) Paradise (everlasting Gardens); wherein rivers flow underneath them; therein they will be adorned with bracelets of gold, and they will wear green garments of fine and thick silk. They will recline therein on raised thrones. How good is the reward, and what an excellent Murtafaq (dwelling, resting place.)! (Part No. 3; Page No. 358) he said that this Ayah is a prophecy of the triumph of the Arabs over Persians and Romans, and the civilization these two empires had.

A: This Ayah describes the reward that Allah prepared in the Hereafter for those who have sincere Iman (Faith) and perform righteous deeds, Verily as for those who believed and did righteous deeds, certainly We shall not make the reward of anyone who does his (righteous) deeds in the most perfect manner to be lost. These! For them will be ‘Adn (Eden) Paradise (everlasting Gardens) This comes after describing the retribution of the wrong-doers who disbelieve and cause mischief and corruption in the earth: Verily, We have prepared for the Zâlimûn (polytheists and wrong-doers) a Fire whose walls will be surrounding them (disbelievers in the Oneness of Allâh). And if they ask for help (relief, water), they will be granted water like boiling oil, that will scald their faces. Terrible is the drink, and an evil Murtafaq (dwelling, resting place.)! As for the interpretation you mentioned in your question, which is the triumph of the Arabs over Persians and the Romans, and enjoying the worldly pleasures of their lands; this is taking words out of their context and is similar to the interpretation of Al-Batiniyyah who deny the reward and retribution and the Day of Judgment.