Augustine of Hippo
Catena Aurea · Johannesevangelium 5
Afterward Jesus findeth him in the temple, and said unto him, Behold, thou art made whole: sin no more, lest a worse thing come unto thee. The man departed, and told the Jews that it was Jesus, which had made him whole. And therefore did the Jews persecute Jesus, and sought to slay him, because he had done these things on the sabbath day. But Jesus answered them, My Father worketh hitherto, and I work. Therefore the Jews sought the more to kill him, because he not only had broken the sabbath, but said also that God was his Father, making himself equal with God. And (He) said unto him, Behold, thou art made whole; sin no more, lest a worse thing come upon thee.
(iv. Super Gen. ad litteram [c. xi.]) It may be said then, that the observance of the sabbath was imposed on the Jews, as the shadow of something to come; viz. that spiritual rest, which God, by the figure of His own rest promised to all who should perform good works.