Surah As-Saff Verse 4

5433 A battle array, in which a large number of men stand, march, or hold together against assault as if they were a solid wall, is a striking example of order, discipline, cohesion, and courage. A solid cemented structure is even a better simile than the usual "solid wall" as the "structure" or building implies a more diversified organisation held together in unity and strength, each part contributing strength in its own way, and the whole held together not like a mass but like a living organism. Cf. also 37:1 and n. 4031.