Yajnashishtamritabhujah

After eating, what remains on the plate is prasad — the remnant blessed by the offering. Those who live by the spirit of yajna — who give before they take, who work before they rest — they partake of a kind of nectar. And that nectar carries them to the eternal Brahman.

But Krishna adds a sharp counterpoint. For someone who lives entirely without any spirit of offering or sacrifice — no generosity, no surrender, no service — even this world holds nothing good, let alone any other. A life without yajna is a life without roots.

This shloka is the conclusion of the yajna section (4.25-4.30). The fruit of yajna and the consequence of its absence are both stated clearly.

The next shloka (4.32) broadens the frame once more: all these many yajnas have spread forth from the mouth of Brahman, and knowing this leads to liberation.