Bible: Knees Feeble

Repeated words found across different books in the Bible (KJV):
Job 4:4
Thy words have upholden him that was falling, and thou hast strengthened the feeble knees.

Isa 35:3
Strengthen ye the weak hands, and confirm the feeble knees.

Eze 7:17
All hands shall be feeble, and all knees shall be weak as water.

Eze 21:7
And it shall be, when they say unto thee, Wherefore sighest thou? that thou shalt answer, For the tidings; because it cometh: and every heart shall melt, and all hands shall be feeble, and every spirit shall faint, and all knees shall be weak as water: behold, it cometh, and shall be brought to pass, saith the Lord GOD.

Heb 12:12
Wherefore lift up the hands which hang down, and the feeble knees;