In this way, many kinds of sacrifice are spread out at the mouth of Brahman. Know them all to be born of action; knowing this, you will be set free.
Explanation
Krishna has just described many kinds of sacrifice (yajña), from ritual offerings to discipline of the senses and breath. Here he says all of them are laid out "at the mouth of Brahman", a phrase often read as the Vedas or as Brahman itself receiving the offering. They all arise from action (karma), and understanding this is said to free Arjuna from the binding effect of action.