About the Surah

(It is not just the victory of Khaiber). Allah is making a prom-ise to you of plenty of booty which you shall gather (in the future). So He has given to you this one (of Khaiber) quickly. And Allah restrained the hands of the people (of  Khaiber) against you (i.e. put fear in their hearts to ensure your comfort) so that it serves as an example for the believers (that Allah fulfils His promise. It also enhanced the Faith of the believers), and so that (through this example) He may keep you on the Straight Path (in every matter. Hence, always put your trust in Allah).