Bhagavad Gita 14.3
The eternal cosmos is My womb, in which I plant the seed from which all beings are born, O prince!
मम योनिर्महद्ब्रह्म तस्मिन् गर्भं दधाम्यहम्।संभवः सर्वभूतानां ततो भवति भारत॥mama yonirmahadbrahma tasmin garbhaṃ dadhāmyaham|saṃbhavaḥ sarvabhūtānāṃ tato bhavati bhārata||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).