John Gill

And he shall restore the lamb fourfold,.... Which was according to the law in Exo 22:1; but Kimchi thinks, because the word is of the dual number, it signifies double the number, and that the sentence was to restore eight lambs, because he being a rich man stole from the poor man; so Mr. Weemse (s) renders it, twice four, twice as much as was commanded in the law; for the Hebrews, he observes, double in the dual number till they come to seven: because he did this thing; committed this theft: and because he had no pity; on the poor man, but took his all. The Jews observe, that accordingly David was punished with the loss of four of his children, that which was born of Bathsheba, Ammon, Tamar, and Absalom; so most of the commentators, but Ben Gersom, instead of Tamar, has Adonijah. (s) Of the Moral Law, l. 2. ch. 10. p. 252. Vid. Gusset. Ebr. Comment. p. 776.