Jihad of Defense: Are a Banner and Permission Required for It?

Question:
May Allah reward you, Your Eminence, father. The questioner says: If jihad requires the permission of the parents and the permission of the one in authority, as well as a banner, then if the jihad is jihad of defense, is a banner required for it?

Answer:
Yes, the one in authority is necessary in both types of jihad: jihad of defense and jihad of seeking. The permission of the one in authority is necessary. You know those who were attacked by the enemy in their lands, so they became groups, each group fighting separately from the others. When they were victorious, what happened? They disputed among themselves and fought one another, each one saying, "I am the one who secured the lands, and I am the one who wants to rule." So they fought among themselves and failed. The disbelieving enemy intervened and plundered the lands, may Allah protect us from this, because of this matter. Therefore, jihad must be under the management of the one in authority, whether it is defense or seeking. Yes.