1 Kings 15:30
Because of the sins of Jeroboam which he sinned, and which he made Israel sin, by his provocation wherewith he provoked the Lord God of Israel to anger.
Cross-reference
1 Kings 15:26 shows that Nadab walked in Jeroboam's sin, providing the specific sin that led to the judgment in 15:30.
1 Kings 14:9-16 is Ahijah's prophecy detailing Jeroboam's sins and the coming destruction, which 15:30 summarizes.
1 Kings 13:34 states that Jeroboam's sin caused his house to be cut off, directly reinforcing the reason for judgment in 15:30.
In 1 Kings 14:16, the same formula 'sins of Jeroboam who sinned and made Israel sin' appears as the reason for Israel's exile.
In 1 Kings 16:3, God threatens Baasha with the same judgment as Jeroboam's house, linking his sins to Jeroboam's pattern.
In 1 Kings 16:13, Baasha and Elah are condemned for making Israel sin, echoing the exact language used for Jeroboam.
In 1 Kings 16:19, Zimri is said to walk in Jeroboam's way and make Israel sin, directly referencing Jeroboam's sin.
In 1 Kings 21:22, Ahab's house is compared to Jeroboam's because he provoked God and made Israel sin.
In 2 Kings 23:15, Josiah destroys the altar Jeroboam built that caused Israel to sin, fulfilling judgment against that sin.