Saying, the prison truly found we shut with all safety,
 &c.] Locked, barred and bolted; 
 and the keepers standing without before the doors;
 both inner and outer in their proper places, diligently discharging their office: 
 but when we had opened we found no man within;
 that is, none of the apostles, for there might be other prisoners in it, who were not released by this means.