Luk 4:15-16
15 And he taught in their synagogues, being glorified of all. 16 And he came to Nazareth, where he had been brought up: and, as his custom was, he went into the synagogue on the sabbath day, and stood up for to read.
It was Jesus's custom to go to the synagogue (church). He never said anything about a coming change. He did not teach people that this was going to stop.
Luk 23:56 And they returned, and prepared spices and ointments; and rested the sabbath day according to the commandment.
They knew Jesus well and rested according to the commandment. Jesus did not tell them to stop obeying the law.
And Paul kept the sabbath
Act 13:14 But when they departed from Perga, they came to Antioch in Pisidia, and went into the synagogue on the sabbath day, and sat down.
Act 13:42-44
42 And when the Jews were gone out of the synagogue, the Gentiles besought that these words might be preached to them the next sabbath.
44 And the next sabbath day came almost the whole city together to hear the word of God.
Act 17:2 And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures,
Act 18:4 And he reasoned in the synagogue every sabbath, and persuaded the Jews and the Greeks.
This was written many years after the cross.. the sabbath still had meaning.