'Riff raff' in the Bible

Meanwhile, certain riff-raff among the people had an insatiable appetite for food. As a result, they wept and turned back, and the Israelis cried out, "If only somebody would feed us some meat!

The people will treat each other harshly; men will oppose each other; neighbors will fight. Youths will proudly defy the elderly and riffraff will challenge those who were once respected.

But [other] Jews became jealous and, recruiting certain ungodly riffraff, they gathered a mob and brought the city to near-riot conditions. They [even] attacked Jason's house and attempted to bring Paul and Silas before the [assembly of] people.