فِي بِضْعِ سِنِينَ لِلَّهِ الْأَمْرُ مِنْ قَبْلُ وَمِنْ بَعْدُ وَيَوْمَئِذٍ يَفْرَحُ الْمُؤْمِنُونَ ﴿۴﴾ بِنَصْرِ اللَّهِ يَنْصُرُ مَنْ يَشَاءُ وَهُوَ الْعَزِيزُ الرَّحِيمُ ﴿۵﴾

﴾4﴿ Fee bid'i sineen; lillaahil amru min qablu wa mim ba'd; wa yawma'iziny yafrahul mu'minoon
﴾5﴿ Binasril laa; yansuru mai yashaaa'u wa Huwal 'Azeezur Raheem

﴾4﴿ In a few specific years, God Almighty fully determines the events before and after, and on that day, the believers will rejoice
﴾5﴿ With the help of God Almighty, He aids whomever He wills, and He alone is the Supreme, the Merciful

[4] (biḍ‘) in Arabic speech refers to a number between three and nine or ten.
For this reason, the commentators have narrated an incident involving Abū Bakr al-Ṣiddīq (may Allah be pleased with him) and Ubayy ibn Khalaf al-Juhmī. Abū Bakr (may Allah be pleased with him) initially set the condition for three years. Then the Messenger of Allah (May Allah bless him and give him peace) said that biḍ‘ includes anything from three to nine years, so he changed the condition to seven years.
As it happened, the Romans were victorious exactly seven years after this verse was revealed.
(li-llāhi al-amr) — here, it refers to the authority over victory and defeat. This phrase affirms the oneness of Allah: that He alone has power and control.
(yawma’idhin yafraḥu al-mu’minūn) — this is glad tidings for the believing Companions, and it is another miracle: that Allah the Exalted, through the Prophet (May Allah bless him and give him peace), gave the news of the believers’ joy seven years in advance on the day of Badr—and it came true clearly and accurately.
[5] In this verse is the central claim of the surah.