18:82
And as for the wall, it was for two boys orphan, in the town, and was underneath it a treasure for them and was their father righteous. So intended your Lord that they reach their maturity, and bring forth their treasure (as) a mercy from your Lord. And not I did it on my (own) accord. That (is the) interpretation (of) what not you were able on it (to have) patience."

18:77
So they set out until when they came (to the) people (of) a town, they asked for food (from) its people, but they refused to offer them hospitality. Then they found in it a wall (that) want(ed) to collapse, so he set it straight. He said, "If you wished surely you (could) have taken for it a payment."

59:14
Not they will fight you all except in towns fortified or from behind walls. Their violence among themselves (is) severe. You think they (are) united, but their hearts (are) divided. That (is) because they (are) a people, not they reason.

9:97
The bedouins (are) stronger (in) disbelief and hypocrisy, and more likely that not they know (the) limits (of) what (has) revealed Allah to His Messenger. And Allah (is) All-Knower, All-Wise.