Ar-Rum 30:4

<h2>Which was revealed in Makkah</h2><p>بِسْمِ اللَّهِ الرَّحْمَـنِ الرَّحِيمِ</p><p>In the Name of Allah, the Most Gracious, the Most Merciful.</p><h2>Foretelling the Victory of the Romans</h2><p>These Ayat were revealed about the victory of Sabur, the king of Persia, over Ash-Sham (Greater Syria), the adjoining partisan states of the Arabian Peninsula, and the outlying regions of the land of the Romans. Heraclius, the emperor of the Romans, was forced to flee to Constantinople where he was besieged for a lengthy period. Then Heraclius regained the upper hand. Imam Ahmad recorded that Ibn `Abbas, may Allah be pleased with him, commented on this Ayah:</p><p>الم - غُلِبَتِ الرُّومُ - فِي أَدْنَى الْأَرْضِ وَهُم مِّن بَعْدِ غَلَبِهِمْ سَيَغْلِبُونَ</p><p>(Alif Lam Mim. The Romans have been defeated. In the nearest land,) He said, "They were defeated and then they were victorious." He said, "The idolators wanted the Persians to prevail over the Romans, because they were idol worshippers, and the Muslims wanted the Romans to prevail over the Persians, because they were People of the Book. This was mentioned to Abu Bakr, who mentioned it to the Messenger of Allah ﷺ. The Messenger of Allah ﷺ said:</p><p>«أَمَا إِنَّهُمْ سَيَغْلِبُون»</p><p>(They will certainly prevail.) Abu Bakr mentioned this to the idolators, …

Within ten years - Allah's is the command in the former case and in the latter - and in that day believers will rejoice

Within a few years. With Allah is the Decision, in the past and in the Future: on that Day shall the Believers rejoice-

Within three to nine years. The decision of the matter, before and after (these events) is only with Allah, (before the defeat of Romans by the Persians, and after, i.e. the defeat of the Persians by the Romans). And on that Day, the believers (i.e. Muslims) will rejoice (at the victory given by Allah to the Romans against the Persians),

In a few years. The matter is up to God, in the past, and in the future. On that day, the believers will rejoice.