'Knees' in the Bible

Then the king's face was changed in him, and his thoughts troubled him; and the joints of his thighs were loosened, and his knees struck one against another.

When Daniel knew that the writing was signed, he went into his house (now his windows were open in his room toward Jerusalem) and he kneeled on his knees three times a day, and prayed, and gave thanks before his God, as he did before.

Behold, a hand touched me, which set me on my knees and on the palms of my hands.