Albert Barnes Commentary Proverbs 17:11

"An evil man seeketh only rebellion; Therefore a cruel messenger shall be sent against him." — Proverbs 17:11 (ASV)

The proverb expresses the reverence of the East for the supreme authority of the king. The “cruel messenger” is probably the king’s officer dispatched to subdue and punish. The Septuagint renders it: The Lord will send a pitiless Angel.