Know that action arises from Brahman, and Brahman arises from the imperishable. Therefore the all-pervading Brahman is always established in sacrifice.
Explanation
Krishna continues explaining the cycle of sacrifice (yajña), the idea that selfless, dutiful action sustains the world. Here he traces action (karma) back to Brahman and Brahman to the imperishable (akṣara), concluding that the all-pervading Brahman is present in sacrifice. Commentators differ on the terms: some take Brahman as the Vedas and the imperishable as the Supreme, while others take Brahman as primal nature (prakṛti) or the body-mind, with the imperishable as the Self.