Charles Ellicott Commentary Acts 16:23

"And when they had laid many stripes upon them, they cast them into prison, charging the jailor to keep them safely:" — Acts 16:23 (ASV)

And when they had laid many stripes upon them.—The words imply a punishment of more than usual severity, such as would leave their backs lacerated and bleeding. So in 1 Thessalonians 2:2, St. Paul speaks of having been shamefully entreated at Philippi.