9:42Had the gain been immediate, and the journey shorter, they would have followed you; but the distance seemed too long for them. Still they swear by God: “Had we been able, we would have marched out with you.” They damn their own souls, and God knows that they are lying.

9:122It is not advisable for the believers to march out altogether. Of every division that marches out, let a group remain behind, to gain understanding of the religion, and to notify their people when they have returned to them, that they may beware.