Mark 1:34 He healed many who were sick with various diseases, and cast out many demons. He didn't allow the demons to speak, because they knew him. (See NAS)
Acts 14:3 Yet Paul and Barnabas remained there for a considerable time, speaking freely and relying on the Lord, while He bore witness to the Message of His grace by permitting signs and marvels to be done by them. (WEY)