Whose number was in the days of David ... - The writer would seem by this passage to have had access to the statistics of the tribes collected by David, when he sinfully “numbered the people” (marginal reference). The numbers given in 1 Chronicles 7:4-5 probably came from the same source.
Related Commentaries of 1 Chronicles 7:2
1 Chronicles 7:2
2 And the sons of Tola; Uzzi, and Rephaiah, and Jeriel, and Jahmai, and Jibsam, and Shemuel, heads of their father's house, to wit, of Tola: they were valiant men of might in their generations; whose number was in the days of David two and twenty thousand and six hundred.