Proverbs 18:19

A brother offended— As a fortified city is a brother assisted by a brother; and they who mutually love one another, are like the bars of a castle. Houb. following the Vulgate. The author of the Observations, remarking that these bars were frequently of brass or iron, says, "According to this, there may be something more in the emphasis of the following passage than has been remarked. Their contentions are like the bars of a castle; not merely hard to be removed, on account of their size, but on account of the materials of which they were made; as not being of wood, but of iron or brass." See 1 Kings 4:13.Isaiah 45:2.