“In the third year of King Asa of Judah, Baasha the son of Ahijah began to reign over all Israel at Tirzah. He reigned twenty-four years. He did what was evil in the sight of Yahweh. He walked in the way of Jeroboam and in the sin that he caused Israel to commit.”
We already saw King Baasha of Israel in his war with King Asa of Judah. He also came to the throne by killing King Nadab. Right away, you can figure that this guy Baasha is a violent sort of person. However, he did rule for 24 years so that his influence was important for the northern tribes. Most important, he was evil in the sight of Yahweh. He made Israel commit sins. Although he came into power to ostensibly combat the evil ways of Jeroboam and his son, he continued to practice their evil ways.