A little gem I found from Aquinas’ commentary on John, 4 ways that the Sabbath pointed to Christ:
“God did what the law, weakened by the flesh, could not do: by sending his own Son in the likeness of sinful flesh, he condemned sin in his flesh, in order that the requirements of the law might be accomplished in us” (Rom 8:3).
The Jews did not do any work on the Sabbath, as a symbol that there were certain things pertaining to the Sabbath which were to be accomplished, but which the law could not do. This is clear in the four things which God ordained for the Sabbath: for he sanctified the Sabbath day, blessed it, completed his work on it, and then rested. These things the law was not able to do. It could not sanctify; so we read: “Save me, O Lord, for there are no holy people left” (Ps 11:1). Nor could it bless; rather, “Those who rely on the works of the law are under a curse” (Gal 3:10). Neither could it, complete and perfect, because “the law brought nothing to perfection” (Heb 7:19). Nor could it bring perfect rest: “If Joshua had given them rest, God would not be speaking after of another day” (Heb 4:8).
These things, which the law could not do, Christ did. For he sanctified the people by his passion: “Jesus, in order to sanctify the people with his own blood, suffered outside the gate” (Heb 13:12). He blessed them by an inpouring of grace: “Blessed be God, the Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing of heaven, in Christ” (Eph 1:3). He brought the people to perfection by instructing them in the ways of perfect justice: “Be perfect, as your heavenly Father is perfect” (Mt 5:48). He also led them to true rest: “We who have believed will find rest,” as is said in Hebrews (4:3). Therefore, it is proper for him to work on the Sabbath, who is able to make perfect those things that pertain to the Sabbath, from which an impotent law rested.