Therefore the showers have been withholden, and there hath been no latter rain; and thou hadst a whore's forehead, thou refusedst to be ashamed.
No latter rain - essential to the crops in Palestine; withheld in judgment (Leviticus 26:19, "I will make your heaven as iron, and your earth as brass;" cf. Joel 2:23, note).
Whore's forehead - (Jeremiah 8:12, "Were they ashamed when they had committed abomination? Nay, they were not at all ashamed, neither could they blush." Hence, the "forehead" of God's servants who prophesied to them had to be "made strong against their foreheads, as an adamant harder than flint," Ezekiel 3:8).