'Prayer' in the Bible

Defraud ye not one the other, except it be with consent for a time, that ye may give yourselves to fasting and prayer; and come together again, that Satan tempt you not for your incontinency.

Every man who takes part in prayer, or gives teaching as a prophet, with his head covered, puts shame on his head.

Judge for yourselves; is it proper for a woman to offer prayer to God [publicly] with her head uncovered?

For if I make use of tongues in my prayers, my spirit makes the prayer, but not my mind.

What then? let my prayer be from the spirit, and equally from the mind; let my song be from the spirit, and equally from mind.

For if you give a blessing with the spirit, how will the man who has no knowledge say, So be it, after your prayer, seeing that he has not taken in what you are saying?