Ezekiel 13:11

say to those who plaster it with untempered mortar, that it will fall. There will be flooding rain, and you, O great hailstones, shall fall; and a stormy wind shall tear it down.

Surrounding context

13:10 "Because, indeed, because they have seduced My people, saying, "Peace!' when there is no peace--and one builds a wall, and they plaster it with untempered mortar--

13:11 say to those who plaster it with untempered mortar, that it will fall. There will be flooding rain, and you, O great hailstones, shall fall; and a stormy wind shall tear it down.

13:12 Surely, when the wall has fallen, will it not be said to you, "Where is the mortar with which you plastered it?"'

Translation and sources