Verses with the word knees in the New Testament (4 verses):

Mark 15:19
And they smote him on the head with a reed, and did spit upon him, and bowing their knees worshipped him.

Luke 5:8
When Simon Peter saw it, he fell down at Jesus' knees, saying, Depart from me; for I am a sinful man, O Lord.

Ephesians 3:14
For this cause I bow my knees unto the Father of our Lord Jesus Christ,

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