"daubing it with untempered mortar"

In Ezek. 13, we find, that the self-constituted prophets of Israel promising peace to Jerusalem, when Yahweh had determined there should be no peace for her, is styled building up a wall, and daubing it with untempered mortar. Ezekiel was commanded to announce to them, that it should fall by an overflowing shower; and then addressing the constituents of the shower, he says, “And ye, O great hailstones, shall fall; and a stormy wind shall rend it.” This prediction was afterwards fulfilled by the Chaldeans under Nebuchadnezzar, who as great hailstones, a mighty and strong power, demonstrated the flimsiness and instability of their wall by laying Jerusalem in ashes and destroying the liars out of her.

Thomas, J. (1997). Eureka: An exposition of the Apocalypse (electronic ed.) (1). West Beach, South Australia: Logos Publications.