Matthew 6:7
And whenever you pray, you must not keep on repeating set phrases, as the heathen do, for they suppose that they will be heard in accordance with the length of their prayers,
Matthew 23:13
"A curse on you, you hypocritical scribes and Pharisees! For you bolt the doors of the kingdom of heaven in men's faces, for you neither go in yourselves, nor do you let those who are trying to do so go in.
Luke 13:25-28
when once the master of the house gets up and shuts the door, and you begin to stand on the outside and to knock on the door again and again and say, 'Lord, open it for us'; but He will answer, 'I do not know where you come from.'
1 Timothy 2:8
So I want the men everywhere to offer prayer, lifting to heaven holy hands which are kept unstained by anger and dissensions.