then thou shalt: The eastern houses being built with flat roofs, which were used for various purposed, as walking, sleeping, etc., it was therefore necessary to have a sort of battlement, or balustrade, to prevent accidents, by people falling off. Exo 21:28-36, Exo 22:6; Rom 14:13; 1Co 10:32; Phi 1:10; 1Th 5:22
thy roof: 2Sa 11:2; Isa 22:1; Jer 19:13; Mat 10:27; Mar 2:4; Act 10:9