1 Chronicles 21:5
And Joab gave the sum of the number of the people unto David. And all they of Israel were a thousand thousand and an hundred thousand men that drew sword: and Judah was four hundred threescore and ten thousand men that drew sword.
Cross-reference
1 Chronicles 27:23
Historical context
1 Chronicles 27:23 explains that those under 20 were not counted because of God's promise — clarifying the census totals in 21:5.
2 Samuel 24:9
Parallel
2 Samuel 24:9 gives the parallel census totals (800k Israel, 500k Judah) that differ from the numbers here — a known discrepancy.
Numbers 1:46
Historical context
Numbers 1:46 records a previous wilderness census of 603,550 — providing a comparative count to David's later census numbers.