Bible Verses About Public Prayer

What is it then? I will pray with the spirit, but I wil pray with the vnderstanding also: I wil sing with the spirite, but I will sing with the vnderstanding also.

Else, when thou blessest with the spirit, howe shall hee that occupieth the roome of the vnlearned, say Amen, at thy giuing of thankes, seeing he knoweth not what thou sayest?

Not forsaking the fellowship that we haue among our selues, as the maner of some is: but let vs exhort one another, and that so much the more, because ye see that the day draweth neere.