3:14  

अन्नाद्भवन्ति भूतानि पर्जन्यादन्नसम्भवः ।
यज्ञाद्भवति पर्जन्यो यज्ञः कर्मसमुद्भवः ॥३- १४॥

annaadbhawanti bhootaani parjanyaadannasambhawaH ।

yadnyaadbhawati parjanyo yadnyaH karmasamudbhawaH ॥३- १४॥

Source: Automatic ITRANS Transliteration

From food come beings. From rain is food produced.
From sacrifice comes rain. Sacrifice is produced by action.

[Living] beings come from food. Food comes from rain. Rain comes from sacrifice. Sacrifice is produced by action.

Source: Milind S. Pandit

The living beings are born from food, food is produced by rain, rain comes by performing Yajna. The Yajna is performed by doing Karma. (See also 4.32)

Source: The Bhagavad-Gita: The Sacred Song

All living bodies subsist on food grains, which are produced from rains. Rains are produced by performance of yajna [sacrifice], and yajna is born of prescribed duties.

Source: Bhagavad Gita As It Is