2 Kings 15:12
This was the word of the Lord which he spake unto Jehu, saying, Thy sons shall sit on the throne of Israel unto the fourth generation. And so it came to pass.
Cross-reference
2 Kings 10:10 declares that none of God's word falls to the ground — the same principle shown in the fulfillment of the prophecy to Jehu here.
2 Kings 10:30 is the original promise to Jehu that his sons to the fourth generation would sit on Israel's throne—now fulfilled.
2 Kings 14:29 records Jeroboam II's death and Zechariah's succession—the fourth generation, directly fulfilling the promise.
2 Kings 13:1 records Jehoahaz, Jehu's son and first successor, beginning the dynasty line that reaches Zechariah.
2 Kings 13:10 records Jehoash, Jehu's grandson, continuing the dynasty promised to the fourth generation.
2 Kings 13:13 records Jehoash's death and Jeroboam II's succession, another step in Jehu's promised line.
Numbers 23:19 states God does not lie or change his mind — this verse is a concrete example of God keeping his promise.
Zechariah 1:6 reports that God's words overtook the fathers — similarly, the word to Jehu was fulfilled here.