(Ps 118, 24) This is the day the LORD has made
 This is the day the LORD has made; let us rejoice in it and be glad
(CCC 2171) God entrusted the sabbath to Israel to keep as a sign of the irrevocable covenant (Cf. Ex 31:16). The sabbath is for the Lord, holy and set apart for the praise of God, his work of creation, and his saving actions on behalf of Israel. (CCC 348) The sabbath is at the heart of Israel's law. To keep the commandments is to correspond to the wisdom and the will of God as expressed in his work of creation. (CCC 349) The eighth day. But for us a new day has dawned: the day of Christ's Resurrection. The seventh day completes the first creation. The eighth day begins the new creation. Thus, the work of creation culminates in the greater work of redemption. The first creation finds its meaning and its summit in the new creation in Christ, the splendour of which surpasses that of the first creation (Cf. Roman Missal, Easter Vigil 24, prayer after the first reading). (CCC 2175) Sunday is expressly distinguished from the sabbath which it follows chronologically every week; for Christians its ceremonial observance replaces that of the sabbath. In Christ's Passover, Sunday fulfills the spiritual truth of the Jewish sabbath and announces man's eternal rest in God. For worship under the Law prepared for the mystery of Christ, and what was done there prefigured some aspects of Christ (Cf. 1 Cor 10:11): Those who lived according to the old order of things have come to a new hope, no longer keeping the sabbath, but the Lord's Day, in which our life is blessed by him and by his death (St. Ignatius of Antioch, Ad Magn. 9, 1: SCh 10, 88).