1 Kings 2:32

2:32 May the Lord punish him for the blood he shed; behind my father David’s back he struck down and murdered with the sword two men who were more innocent and morally upright than he – Abner son of Ner, commander of Israel’s army, and Amasa son of Jether, commander of Judah’s army.

1 Kings 2:34

2:34 So Benaiah son of Jehoiada went up and executed Joab; he was buried at his home in the wilderness.

1 Kings 2:46

2:46 The king then gave the order to Benaiah son of Jehoiada who went and executed Shimei.

So Solomon took firm control of the kingdom.