Ezekiel 31:15
Thus saith the Lord GOD; In the day when he went down to the grave I caused a mourning: I covered the deep for him, and I restrained the floods thereof, and the great waters were stayed: and I caused Lebanon to mourn for him, and all the trees of the field fainted for him.
The verse presents the downfall of Assyria through the image of a great cedar brought down to the grave. That downfall was brought on by its pride and cruelty. In the verse God causes mourning for the fallen power, covers the deep for him, restrains its floods so that the great waters are stayed, causes Lebanon to mourn for him, and makes all the trees of the field faint for him. The fall was so great that the surrounding world mourns and the nations shake at the sound of it.