Matthew 6:7
But when ye pray, use not vain repetitions, as the heathens; for they think they shall be heard for their much speaking.
Matthew 23:13
But wo to you, scribes and Pharisees, hypocrites; for ye shut the kingdom of heaven against men: ye go not in, neither suffer ye them that are entring to go in.
Luke 13:25-28
When once the master of the house is risen up and hath shut the door, and ye begin to stand without, and knock at the door saying, Lord, Lord, open to us: He shall answer and say to you, I know you not whence ye are.
1 Timothy 2:8
I will therefore that men pray in every place, lifting up holy hands, without wrath and doubting: