re 'ritual' foot baths..
Older than Mohammad
"He rises from supper, and laid aside his garments; and took a towel, and girded himself. 5 After that he poured water into a basin, and began to wash the disciples' feet, and to wipe them with the towel wherewith he was girded. 6 Then cometh he to Simon Peter: and Peter said unto him, Lord, dost thou wash my feet? 7 Jesus answered and said unto him, What I do thou know not now; but thou shall know hereafter. "