Acts 5:23 "We found the prison shut and locked, and the guards standing before the doors, but when we opened them, we found no one inside!" (See RSV)
Acts 12:6 The same night when Herod was about to bring him out, Peter was sleeping between two soldiers, bound with two chains. Guards in front of the door kept the prison. (See RSV NIV)
Acts 12:19 And Herod, when he sent for him, and he was not there, after questioning the watchmen, gave orders that they were to be put to death. Then he went down from Judaea to Caesarea for a time. (See RSV)
Jeremiah 51:12 Set up a standard against the walls of Babylon, make the watch strong, set the watchmen, prepare the ambushes; for Yahweh has both purposed and done that which he spoke concerning the inhabitants of Babylon. (See NAS)