Bible Verses About Public Prayer

What is it then? I will pray with the spirit, I will pray also with the understanding, I will sing with the spirit, I will sing also with the understanding.

Else, if thou shalt bless with the spirit, how shall he that holdeth the place of the unlearned say, Amen, to thy blessing? Because he knoweth not what thou sayest.

Not forsaking our assembly, as some are accustomed: but comforting one anther, and so much the more as you see the day approaching.