Ezekiel 21:12

¹² Cry and howl, son of man, For it hath been among My people, It [is] among all the princes of Israel, Cast unto the sword have been My people. Therefore strike on thy thigh,

Knees weak as water

In Ezekiel 7:17, this signifies grief on account of the loss of the love of good. (Apocalypse Explained 677[7])