Some offer the senses like the ear, meaning the sensory functions like hearing, seeing, smelling, etc., into the fire of their own restraint. Still others offer sound, hearing, etc. into the fire of their respective senses.
India’s cultural and traditional scenario is amazing, profound and abstruse. How our ancients evolved these subtle disciplines, warrants deep evaluation and research. Our own personality, they felt, is the sole genesis of all experience and introspection. Control or moderation hence is to be applied there alone. Keeping this in mind, Krishna refers briefly to a variety of yajµas, all centred in human personality, eschewing all outside factors altogether.
He is not referring to not employing the senses at all. For, that only defeats the real purpose (3.6). Employ the senses for chanting, reciting and hearing spiritual matters, avoiding other indulgences.
Arjuna, King Pareekshit and Rama, all illustrate how devout spiritual listening can be. In this, words are offered to ears, and consequently enlightenment transpires.