The word(s) "wall" appears 22 time(s) in 21 verse(s) in Quran in Mohsin Khan translation.

(21) Calling (all) such as turn their backs and turn away their faces (from Faith) [picking and swallowing them up from that great gathering of mankind on the Day of Resurrection just as a bird picks up a food-grain from the earth with its beak and swallows it up] (Tafsir Al-Qurtubi)