https://www.btstories.com/death-of-david-joab/

Before David died, he gave Solomon instructions

on how he should rule as king. “Walk in the ways

of God’s commandments and you’ll be successful.

Kill Joab when the time is right. He murdered two

commanders of Israel—Abner, Saul’s commander,

and Amasa, his cousin. Both of these men trusted

him because it was a time of peace.