Acts 13:14 (KJV) – 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 – And when the Jews were gone out of the synagogue, the Gentiles besought that these words might be preached to them the next sabbath.
Acts 13:44 – And the next sabbath day came almost the whole city together to hear the word of God.
Further information:
Acts 13 – do Christians keep the Sabbath in Acts?
Acts 13 – Returning to hear Paul the next sabbath?
Are there examples of Christian sabbath observance in Acts?