Why then is this people of Jerusalem slidden back by a perpetual backsliding? they hold fast deceit, they refuse to return.
Why then is this people of Jerusalem slidden back by a perpetual backsliding? - rather, as the Hebrew х showbªbaah (H7725) ... mªshubaah (H4878)] is the same as Jeremiah 8:4, to which this verse refers, 'turned away with a perpetual turning way.'
Perpetual - in contrast to the 'arise' (rise again) (Jeremiah 8:4).
Refuse to return - in contrast to "shall he ... not return" (Jeremiah 8:4; Jeremiah 5:3, "They have refused to return").