9:87They prefer to be with those who stay behind. Their hearts were sealed, so they do not understand.

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.

9:127And whenever a chapter is revealed, they look at one another, “Does anyone see you?” Then they slip away. God has diverted their hearts, because they are a people who do not understand.