Charles Ellicott Commentary Jeremiah 13:27

"I have seen thine abominations, even thine adulteries, and thy neighings, the lewdness of thy whoredom, on the hills in the field. Woe unto thee, O Jerusalem! thou wilt not be made clean; how long shall it yet be?" — Jeremiah 13:27 (ASV)

Your adulteries. —The words refer primarily to the spiritual adultery of the idolatries of Judah. The neighings, as in Jeremiah 2:24; Jeremiah 5:8, express the unbridled eagerness of animal passion transferred in this passage to the spiritual sin. The abominations on the hills are the orgiastic rites of the worship of the high places, which are further described as in the field to emphasize their publicity.

Will you not be made clean? —Better, you will not be cleansed; after how long yet? Sad as the last words are, they in some measure soften the idea of irretrievable finality, “Will the time ever come, and if so, when?” Like the cry addressed to God, How long, O Lord ... (Revelation 6:10), it implies a hope, though only just short of despair.