So here it is prescribed that yajñārthāt karmaṇaḥ anyatra (BG 3.9). That is... We have discussed. Yajña-śiṣṭāśinaḥ santo mucyante sarva-kilbiṣaiḥ (BG 3.13). If we perform sacrifice for the satisfaction of the Supreme, then the result will be that we shall be free from all reaction of our sinful life. And if we do not do that, bhuñjate te tv aghaṁ pāpā ye pacanty ātma-kāraṇāt. Ātma-kāraṇāt means simply for his own sense gratification.
Now, that yajña, I have... Several times before you I have explained. Aśnāti. Aśnāti means one who eats. So our yajña begins from the eating, because eating is the first item of the necessity of our life. Eating, sleeping, fearing, and mating. Now, eating is essential. So here in the Bhagavad-gītā openly speaks that just control your eating process in the yajña. Just begin your karma-yoga from the eating formula. Then, gradually, other things will develop.