The one who asks you permission to stay back is those who didn’t believe with Lord Allah and the Last Day and whose hearts are filled with doubt and are wavering because of their doubts.
It is told in verse 24: 62: “The true believers are only those who believed with Allah and His Messenger, who if are gathered with Messenger on a matter requiring collective action don’t depart until they have obtained his permission- only those who ask your permission are the ones who truly believe with Allah and His Messenger - so when they ask your permission to leave and attend to their private business, you may give permission to those you intend, and you seek forgiveness to Allah for them; surely, Allah is the Oft-Forgiving, Merciful”.
Today there no group of believers and so there is no war. But the odd-believer will propagate Adhikr—the Food, Cloth, and Sight of the human soul—as explained in verse 7: 26—to entire mankind to utilize It as the Balance and Trust to keep the universe in its equilibrium. Those who are nearer Lord will not be arrogant in helping the Impartial Lord by propagating Adhikr—the Best Interpretation of Lord’s Book—as explained in verses 7: 205-206. The aimless hypocrites and their heedless followers are those who hide and reject Adhikr and are trying to extinguish the propagation of It to entire mankind as explained in verses 9: 32-33. They are welcoming 30th pseudo-prophet Antichrist who is coming to wipe out Islam throughout the world except for Hejaz as explained in verses 7: 127 and 137. See explanation 3: 136; 6: 133; 9: 5 and 73.