“And all the citie was moued, and the people ran together: and they tooke Paul, and drew him out of the Temple: and forthwith the doores were shut.”
1611 King James Version (KJV)
21:30 And immediately the gates were shut - Both to prevent any farther violation of the temple; and to prevent Paul's taking sanctuary at the horns of the altar.
Ac 21:30 They took Paul, and drew him out of the temple. He was, no doubt, within the inner courts, and was hurried without, and the gates shut, to prevent the pollution of the sacred courts by the shedding of blood. They proposed to slay him when they had dragged him where it could be done without profanation. They were willing to murder, but not to profane the temple.