'Knees' in the Bible

Then the king's countenance was changed in him, and his thoughts troubled him; and the joints of his loins were loosed, and his knees smote one against another.

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

And, behold, a hand touched me, which set me upon my knees and upon the palms of my hands.