'Fervent' in the Bible

On that same occasion Jesus was filled by the Holy Spirit with rapturous joy. "I give Thee fervent thanks," He exclaimed, "O Father, Lord of Heaven and earth, that Thou hast hidden these things from sages and men of understanding, and hast revealed them to babes. Yes, Father, for such has been Thy gracious will.

So Peter was kept in prison; but long and fervent prayer was offered to God by the Church on his behalf.