"Khad`ah" means deception, i.e., employing a strategy which causes misunderstanding to the enemy, and one's real intent does not become evident to them. This is permissible in Islam in the state of war.
The Ahadith mentioned in this chapter make the importance of Jihad and the reason for so much stress on it abundantly clear. These also show how great a crime it is to ignore it. It is very unfortunate indeed that present-day Muslims are guilty of renouncing Jihad in every part of the world. May Allah help us to overcome this negligence.