Again, truly I tell you that if two of you on earth agree about anything they ask for, it will be done for them by my Father in heaven. Matthew 18:19 NIV

In the same way, the Spirit helps us in our weakness. We do not know what we ought to pray for, but the Spirit himself intercedes for us through wordless groans. Romans 8:26 NIV

If you remain in Me and My words remain in you [that is, if we are vitally united and My message lives in your heart], ask whatever you wish and it will be done for you. John 15:7 AMP

I have said these things to you, that in me you may have peace. In the world you will have tribulation. But take heart; I have overcome the world. John 16:33 ESV