Matthew 6:5, 7-8

And when ye pray, ye shall not be as the hypocrites: for they love to stand and pray in the synagogues and in the corners of the streets, that they may be seen of men. Verily I say unto you, They have received their reward.

And in praying use not vain repetitions, as the Gentiles do: for they think that they shall be heard for their much speaking. Be not therefore like unto them: for your Father knoweth what things ye have need of, before ye ask him.