Matthew 7:7
"Ask [God for something] and it will be given to you; look [to God for something] and you will find it; knock [on the door of opportunity] and it will be opened up to you.
Acts 4:24-33
And when the disciples heard this report they united their voices to God in prayer [saying]: "O, Lord, You made the heaven, the earth, the sea and everything in them.
Acts 10:30
Cornelius [then] said, "Four days ago, when I was at home, praying at the appointed hour (i.e., three o'clock in the afternoon) [See verse 3], suddenly a man in bright clothing appeared in front of me.
Acts 12:12-17
After thinking about the matter [for awhile], he decided to go to the house of Mary, mother of John Mark, where a large gathering [of Christians] was praying.
Romans 8:26
And in the same way, the Holy Spirit helps [us in] our weakness; for we do not know what we ought to pray for [Note: Some translators understand this as "how to pray"]. But the Holy Spirit goes to God on our behalf with groanings [in our hearts] that are not expressed [in words].