The word(s) "wall" appears 20 time(s) in 18 verse(s) in Quran in Muhammad Habib Shakir translation.

(11) Thus We made the earth to swallow up him and his abode; so he had no body of helpers to assist him against Allah nor was he of those who can defend themselves.

(12) So each We punished for his sin; of them was he on whom We sent down a violent storm, and of them was he whom the rumbling overtook, and of them was he whom We made to be swallowed up by the earth, and of them was he whom We drowned; and it did not beseem Allah that He should be unjust to them, but they were unjust to their own souls.

(13) So the fish swallowed him while he did that for which he blamed himself

(14) And has there come to you the story of the litigants, when they made an entry into the private chamber by ascending over the walls?

(15) On the day when the hypocritical men and the hypocritical women will say to those who believe: Wait for us, that we may have light from your light; it shall be said: Turn back and seek a light. Then separation would be brought about between them, with a wall having a door in it; (as for) the inside of it, there shall be mercy in it, and (as for) the outside of it, before it there shall be punishment.

(16) They will not fight against you in a body save in fortified towns or from behind walls; their fighting between them is severe, you may think them as one body, and their hearts are disunited; that is because they are a people who have no sense.

(17) Surely Allah loves those who fight in His way in ranks as if they were a firm and compact wall.

(18) Are you secure of those in the heaven that He should not make the earth to swallow you up? Then lo! it shall be in a state of commotion.