وَيُسَوَّى اللَّبِنُ عَلَى اللَّحْدِ
Translation: Unbaked bricks are fitted across the opening of the lahd.
Labin is an unbaked sun-dried brick, in contrast with ajurr, a fired brick.
Closing the opening protects the body from direct earthfall when the grave is filled; it is distinct from making an elaborate permanent chamber.