Matthew 6:5-7

5And when thou prayest, thou shalt not be as the hypocrites; for they love to pray standing in the synagogues and in the corners of the streets so that they should appear to men. Verily I say unto you, They have their reward.

6But thou, when thou prayest, enter into thy chamber, and having shut thy door, pray to thy Father who is in secret, and thy Father who sees in secret will render [it] to thee.

7But when ye pray, use not vain repetitions, as those who are of the nations: for they think they shall be heard through their much speaking.