Verily there was a sign for you in the two detachments met together, one was fighting in the way of Lord Allah, while the other were disbelievers. They saw them twice their number by eyesight, and Allah strengthens with His help to whom He wishes, indeed, there is a moral for those who have Insight.
This verse mentions the Battle of Badr that happened between Messenger’s followers and disbelievers. Disbelievers were thrice than the followers. But at the first sight followers felt that the disbelievers are only just twice of them and thus Lord empowered courage and stability for the followers. At the sight of disbelievers, Lord made followers twice in number, and thereby instilled terror in the heart of disbelievers. It is told in verses 8: 43-44 to Messenger Muhammad: “In your dream, Lord showed to you disbelievers few in number, and if He had shown them to you as many, you would have lost courage and would have disputed in the matter. But indeed, Allah saved you from that, Indeed, He is Knower of the state of chests. And you remember when He showed them to you as few in your eyes when both of you met, and He made you appear as few in their eyes so that Lord might accomplish a matter already destined, and to Lord returns all matters”. The disbelievers who came with great pride were well-armed, more than a thousand in number, and had made battle as their lifestyle. Against them on the other side, it was a small party of the Lord with only 313 members, inexpert in war and without sufficient weapons. But Lord sent down Angels to help them against the disbelievers.
The Lord says to Messenger in verse 8: 17: “It was not you who killed them, but it was Lord who killed them; when you threw, you didn’t throw, but it was the Lord who threw so that He might pass the believers successfully through this excellent trial. indeed, the Lord is the All-Hearing, All-knowing”. It is told in verse 4: 79: “Any good happens to you, it is from your Lord, while any evil happens to you, it is from yourselves”. That means with the remembrance of the Lord with Adhikr which is the Safeguard, no evil will affect anyone. The believer will stand firmly by holding the Safeguard Adhikr in any scenario of his life. So Lord will safeguard him beyond any cause and reason. In short, whoever holdfasts Adhikr, he did holdfast Lord and is guided into the Straightpath as explained in verse 5: 48. As there is no group of believers anywhere in the world today, there is no battle with weapons. But the believer is commanded to do Jihad with Adhikr against the hypocrites and Kuffar as explained in verses 9: 73 and 25: 52. See explanation 2: 2: 243, 251, and 8: 45-47.