In Acts 9:26-28, we read (NKJV, emphasis mine):
And when Saul had come to Jerusalem, he tried to join the disciples; but they were all afraid of him, and did not believe that he was a disciple. But Barnabas took him and brought him to the apostles. And he declared to them how he had seen the Lord on the road, and that He had spoken to him, and how he had preached boldly at Damascus in the name of Jesus. So he was with them at Jerusalem, coming in and going out.
What does "coming in and going out" (NKJV) refer to? (Apparently, the Byzantine text, as opposed to the TR and NU text, omits "and going out.") Is it a reference to Saul assembling with the disciples for worship, or some other meaning?