Luke 18:5 (KJV)

And he spake a parable unto them to this end, that men ought always to pray, and not to faint;

Saying, There was in a city a judge, which feared not God, neither regarded man:

And there was a widow in that city; and she came unto him, saying, Avenge me of mine adversary.

And he would not for a while: but afterward he said within himself, Though I fear not God, nor regard man;

And the Lord said, Hear what the unjust judge saith.

And shall not God avenge his own elect, which cry day and night unto him, though he bear long with them?

I tell you that he will avenge them speedily. Nevertheless when the Son of man cometh, shall he find faith on the earth?

And he spake this parable unto certain which trusted in themselves that they were righteous, and despised others:

Two men went up into the temple to pray; the one a Pharisee, and the other a publican.