This is another excerpt from Bill Warner’s book Abridged Koran where the verses of Koran are arranged in their chronological order and provided with facts from prophet Muhammad’s life, giving context for them.
CHAPTER 20 MOHAMMED’S FINAL JIHAD (continued)
After all the victories, some Muslims said that the days of fighting were over and even began to sell their arms. But Mohammed forbid this, saying, “There shall not cease from the midst of my people a party engaged in fighting for the truth, until the Antichrist appears.” Jihad was recognized as the normal state of affairs. Indeed, the Koran prepares the way for this:
9:122 The faithful should not all go out together to fight. If a part of every troop remained behind, they could instruct themselves in their religion and warn their people when they return to them that they should guard against evil.
9:123 Believers, fight the unbelievers who are near you, and let them find you to be tough and hard. Know that Allah is with those who guard against evil.