'Comforter' in the Bible

Then I returned and saw all the oppressions that are done under the sun: and behold, the tears of those who 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 didn't remember her latter end; therefore is she come down wonderfully; she has no comforter: see, Yahweh, my affliction; for the enemy has magnified himself.

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