'Comforter' in the Bible

Then I returned and saw all the oppressions that are done under the sun: and, behold, the tears of such as were oppressed, and they had no comforter; and on the side of their oppressors there was power; but they had no comforter.

Her filthiness was in her skirts; she remembered not her latter end; Therefore is she come down wonderfully; she hath no comforter: Behold, O Jehovah, my affliction; for the enemy hath magnified himself.

For these things I weep; mine eye, mine eye runneth down with water; Because the comforter that should refresh my soul is far from me: My children are desolate, because the enemy hath prevailed.