Chapter 3 · The Yoga of Action · Krishna said
Bhagavad Gita 3.14 — The cycle of life
अन्नाद्भवन्ति भूतानि पर्जन्यादन्नसम्भवः। यज्ञाद्भवति पर्जन्यो यज्ञः कर्मसमुद्भवः ॥
annādbhavanti bhūtāni parjanyādannasambhavaḥ | yajñādbhavati parjanyo yajñaḥ karmasamudbhavaḥ ||
Meaning
Living beings come from food, food comes from rain, rain comes from yajna, and yajna is born of action.