Proverbs 18:19 in the World English Bible
A brother offended is more difficult than a fortified city. Disputes are like the bars of a fortress.
Context
18 The lot causeth contentions to cease, and parteth between the mighty.
19 A brother offended is harder to be won than a strong city: and their contentions are like the bars of a castle.
20 A man’s belly shall be satisfied with the fruit of his mouth; and with the increase of his lips shall he be filled.