Catechism of the Catholic Church
a. Para. 592: Jesus did not abolish the Law of Sinai, but rather fulfilled it (cf. Mt 5:17-19) with such perfection (cf. Jn 8:46) that he revealed its ultimate meaning (cf. Mt 5:33) and redeemed the transgressions against it (cf. Heb 9:15).
Para. 578: . . . The Law indeed makes up one inseparable whole, and St. James recalls, "Whoever keeps the whole law but fails in one point has become guilty of all of it" (Jas 2:10; cf. Gal 3:10; 5:3).
Para. 582: Going even further, Jesus perfects the dietary law, so important in Jewish daily life, by revealing its pedagogical meaning through a divine interpretation: "Whatever goes into a man from outside cannot defile him . . . (Thus he declared all foods clean). What comes out of a man is what defiles a man. For from within, out of the heart of man, come evil thoughts. . . ." (Mk 7:18-21; cf. Gal 3:24). In presenting with divine authority the definitive interpretation of the Law, Jesus found himself confronted by certain teachers of the Law . . .
Para. 580: . . . Jesus fulfills the Law to the point of taking upon himself "the curse of the Law" incurred by those who do not "abide by the things written in the book of the Law, and do them," for his death took place to redeem them "from the transgressions under the first covenant" (Gal. 3:13; 3:10; Heb. 9:15).