Isaiah 44:17

He falleth down unto it - There were four forms of adoration used among the Hebrews:

1. השתחוה Hishtachavah , The prostration of the whole body.
2. קדד Kadad , The bowing of the head.
3. כרע Cara , The bending of the upper part of the body down to the knees.

4. ברך Barach , Bowing the knee, or kneeling. See on Isaiah 49:23 ; (note).