The 4845 Gospel according to Matthew was written to the Jews. For they laid particular stress upon the fact that Christ [should be] of the seed of David. Matthew also, who had a still greater desire [to establish this point], took particular pains to afford them convincing proof that Christ is of the seed of David; and therefore he commences with [an account of] His genealogy.
Edited by P. Possin, in a Catena Patrum on St. Matthew. See book iii. chap. xi. 8.