Did the Jewish believers in Acts who accepted Jesus as Messiah continue to keep the Law and attend the Temple?
Yes. The believing Jews in Acts who accepted Jesus as Messiah continued as law-keepers. No one had told them to stop keeping the Law or going to the Temple. Ananias, seven years after Pentecost, was a devout believer still under the Law, and Peter still observed kosher restrictions.
Les teaches that when you get into the Book of Acts, all these believing Jews who were believers that Christ was the Messiah are still law-keepers. Nobody had told them to quit going to the Temple, and no one had told them to stop keeping the Law. He points to Acts 22, where Paul rehearses his Damascus experience and refers to Ananias, a devout man after the Law—seven years after Pentecost—as a devout believer still under the Law. Peter also shows his law-keeping stance at Cornelius’s door, saying it was unlawful for him, a Jew, to come unto one of another nation. When the sheet came down and the Lord said, “Rise, Peter, kill and eat,” Peter refused, saying he had never eaten anything that was not kosher or unclean. Les also notes that the Temple was going full speed ahead at the time of Christ’s earthly ministry, with up to a million animals a year being sacrificed according to Josephus.