John Gill Commentary 1 Chronicles 23:17

"And the sons of Eliezer were: Rehabiah the chief; and Eliezer had no other sons; but the sons of Rehabiah were very many." — 1 Chronicles 23:17 (ASV)

And the sons of Eliezer were Rehabiah the chief
The first and only begotten, as it follows:

and Eliezer had none other sons ;
before nor after him:

but the sons of Rehabiah were very many ;
or greatly multiplied; not, as the Targum says, above 600,000; the number of Israel, as the Jewish writers ^F13 fancy; which they gather from (Exodus 1:7) (32:10) (Numbers 11:21) , and that though Moses deprecated the multiplication of his seed, God fulfilled it.

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FOOTNOTES:

• F13: T. Bab Beracot, fol. 7. 1, 2, Bemidbar Rabba, sect. 16. fol. 220. 4.