NET
21 After threatening them further, they released them, for they could not find how to punish them on account of the people, because they were all praising God for what had happened.
Darby
21 But they, having further threatened them, let them go, finding no way how they might punish them, on account of the people, because all glorified God for what had taken place;
KJV
21 So when they had further threatened them, they let them go, finding nothing how they might punish them, because of the people: for all [men] glorified God for that which was done.