Those to whom the men told: “Indeed men have gathered against you, so you fear them”. Then they increased their faith and told: “Lord Allah is enough for us, what a Best Custodian!”
In the next year after the Battle of Uhud, the enemies were not in a good condition for fighting in Badr. So, they sent some rumor spreaders to Medina informing that a huge army was gathered under the leadership of Abu Sufyan to fight against the believers. On hearing this, the believers told: “Lord is enough for us, what a Best Custodian!” as told in this verse.
Since there is no group of believers anywhere in the world, there is no war. Any Fujjar who doesn’t testify Adhikr, at the time of his death Lord will tell him: “Nay, you have received My verses, but you rejected Them, you were arrogant, and you were among the disbelievers” as told in verses 39: 58-59. They are the worthless people mentioned in verse 25: 18 who will be dragged prone on their faces into Hell, such are in the worst place, and they are the most strayed as told in verses 25: 33-34. See explanation 2: 112, 177, and 3: 148.