'Persistently' in the Bible

So Peter was kept in prison, but fervent and persistent prayer for him was being made to God by the church.

They said to her, “You are out of your mind!” But she kept insisting that it was so. They kept saying, “It is his angel!”

But they quarrelled with him about certain matters connected with their own religion, and about one Jesus who had died, but--so Paul persistently maintained--is now alive.