2 Samuel 13:5

And Jonadab said unto him, Lay thee down on thy bed, and make thyself sick: and when thy father cometh to see thee, say unto him, I pray thee, let my sister Tamar come, and give me meat, and dress the meat in my sight, that I may see it, and eat it at her hand.

Cross-reference

In 2 Samuel 16:21-23, Ahithophel's advice to Absalom parallels Jonadab's—both are cunning plans using sex to achieve political ends.

Psalm 50:18 condemns approving a thief and keeping company with adulterers—Jonadab does exactly that by advising Amnon's sin.

Psalm 50:19 condemns deceitful speech — Jonadab's advice to use lies exemplifies this evil use of the tongue.