Matthew 21:22
"and everything that you ask for in your prayers you shall have, if you believe."
John 11:42
"Father, I thank thee that thou hast listened to me. And I knew that thou art ever listening to me, but for the sake of the crowd who are standing about, I said it, in order that they may believe that thou hast sent me."
John 16:23
And in that day you will ask me no questions. "Most solemnly I tell you that whatever you ask the Father in my name, he will give you.
Romans 8:27-28
And the Searcher of Hearts knows what the Sprit's meaning is, because his intercessions for the saints are according to the will of God.
1 John 5:14-15
Now the confidence which we have in him is this, that he listens to us whenever we ask anything that is in accordance with his will.