Acts 16:35 - Ellicott's Commentary On The Whole Bible

The magistrates sent the serjeants. — Literally, the rod-bearers, or lictors. They would probably be the very officers who had inflicted the stripes. We are not told what led to this sudden change of action. Possibly, as has been suggested, the earthquake had alarmed the strategi; more probably they felt that they had acted hastily in ordering the accused to be punished with no regular trial, and without even any inquiry as to their antecedents. They had an uneasy sense of having done wrong, and they wanted to wash their hands of the business as quietly as possible.