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The world is bound by actions other than those performed for the sake of sacrifice; do thou, therefore, O son of Kunti (Arjuna), perform action for that sake (for sacrifice alone), free from attachment.

This world is bound by action, except for action done as sacrifice. So, son of Kunti, perform action for that purpose, free from attachment.

Krishna introduces the idea of sacrifice (yajña) as the key to action that does not bind. Action done for selfish ends ties a person to its results, but action offered as yajña, for a purpose larger than oneself, leaves one free. The word originally meant Vedic ritual offering, and some readers keep that sense, while others take it more widely as any work done in a spirit of offering. Either way, the verse shows Arjuna that the answer to binding action is not to stop acting but to change its aim.