John Gill Commentary 1 Chronicles 7:9

"And they were reckoned by genealogy, after their generations, heads of their fathers` houses, mighty men of valor, twenty thousand and two hundred." — 1 Chronicles 7:9 (ASV)

And the number of them
Of the posterity of the sons of Becher:

after their genealogy by their generations, heads of the house of
their fathers, mighty men of valour ;
as they increased in succeeding ages, and at the time of David:

was twenty thousand and two hundred .