'Praying' in the Bible

The Lord said to him, "Arise, and go to the street which is called Straight, and inquire in the house of Judah for one named Saul, a man of Tarsus. For behold, he is praying,

"I was in the city of Joppa praying, and in a trance I saw a vision: a certain container descending, like it was a great sheet let down from heaven by four corners. It came as far as me.

Thinking about that, he came to the house of Mary, the mother of John whose surname was Mark, where many were gathered together and were praying.

But about midnight Paul and Silas were praying and singing hymns to God, and the prisoners were listening to them.