sit at (someone's) feet
To be in a position of devotion or worship to someone; to pay homage or reverential attention to someone. I've been sitting at the professor's feet ever since I heard his astounding lecture on quantum mechanics. My brother chose to sit at the saints' feet for the rest of his life, but I do not intend to pursue such a life of the cloth.
sit at someone's feet
be someone's pupil or follower.