Chapter 14 · The Three Qualities · Krishna said
Bhagavad Gita 14.3 — The seed of creation
मम योनिर्महद् ब्रह्म तस्मिन्गर्भं दधाम्यहम्। सम्भवः सर्वभूतानां ततो भवति भारत ॥
mama yonirmahad brahma tasmingarbhaṃ dadhāmyaham | sambhavaḥ sarvabhūtānāṃ tato bhavati bhārata ||
Meaning
Great Nature (Prakriti) is My womb, and in it I place the seed. From this all living beings are born.