https://www.btstories.com/wise-woman-of-abel/

David removed Joab from his command of the army. He replaced him with Amasa, who was also his nephew. He said to Amasa, “Gather my troops in three days so you can hunt down Sheba.”

Amasa started gathering an army, but it took him too long. He wasn’t back in three days. David said to Joab’s brother, “We must act fast if we’re to defeat Sheba. If we give him time, he’ll be a bigger danger then Absalom ever was. Go after him immediately.”