Bhagavad Gita 14.3
मम योनिर्महद्ब्रह्म तस्मिन्गर्भं दधाम्यहम्। सम्भवः सर्वभूतानां ततो भवति भारत।।14.3।।
mama yonirmahadbrahma tasmingarbhaṃ dadhāmyaham| sambhavaḥ sarvabhūtānāṃ tato bhavati bhārata||14.3||
mama yonirmahadbrahma tasmingarbham dadhamyaham sambhavah sarvabhutanam tato bhavati bharata14.3
Meaning
The great Brahman (Prakriti, material nature) is Krishna's womb, in which He places His seed. From this union of spirit and matter, all beings are born.
हे भारत! मेरी महद् ब्रह्मरूप प्रकृति, (भूतों की) योनि है, जिसमें मैं गर्भाधान करता हूँ; इससे समस्त भूतों की उत्पत्ति होती है।
This is verse 3 of 27 in Chapter 14 (Gunatraya Vibhaga Yoga) of the Bhagavad Gita.