1 Kings 2:11
And the days that David reigned over Israel were forty years: seven years reigned he in Hebron, and thirty and three years reigned he in Jerusalem.
Cross-reference
1 Kings 11:42 similarly summarizes Solomon's 40-year reign, using the same formula as the main verse.
2 Samuel 5:4 also gives David's reign as 40 years and adds his age of 30 when he began.
1 Chronicles 29:27 repeats the same reign lengths — 7 years in Hebron, 33 in Jerusalem, total 40 — verbatim.
2 Samuel 2:11 gives the precise duration (7 years 6 months) of David's reign in Hebron, matching the main verse.
2 Samuel 5:5 contains an identical summary of David's reign lengths over Israel and Judah.
1 Chronicles 3:4 repeats the same reign lengths (7 years Hebron, 33 Jerusalem) from the Chronicler's perspective.
1 Chronicles 11:1 describes all Israel gathering to David at Hebron, the event that led to his reign over all Israel.
1 Chronicles 26:31 mentions an event in David's 40th year, confirming the total reign length from the main verse.