When he realized this, he went to the house of Mary, the mother of John Mark, where many had assembled and were praying.

Jerusalem, I have appointed watchmen on your walls; they will never be silent, day or night. You, who remind the LORD, no rest for you!

Do not give Him rest until He establishes and makes her Jerusalem the praise of the earth.

Again, I assure you: If two of you on earth agree about any matter that you pray for, it will be done for you by My Father in heaven.

He then told them a parable on the need for them to pray always and not become discouraged:

So if one member suffers, all the members suffer with it; if one member is honored, all the members rejoice with it.

And you can join in helping with prayer for us, so that thanks may be given by many on our behalf for the gift that came to us through [the prayers of] many.

With every prayer and request, pray at all times in the Spirit, and stay alert in this, with all perseverance and intercession for all the saints.

For this I am an ambassador in chains. Pray that I might be bold enough in Him to speak as I should.

Pray constantly.

Remember the prisoners, as though you were in prison with them, and the mistreated, as though you yourselves were suffering bodily.

Therefore, confess your sins to one another and pray for one another, so that you may be healed. The intense prayer of the righteous is very powerful.