Bhagavad Gita 9.7
सर्वभूतानि कौन्तेय प्रकृतिं यान्ति मामिकाम्। कल्पक्षये पुनस्तानि कल्पादौ विसृजाम्यहम्।।9.7।।
sarvabhūtāni kaunteya prakṛtiṃ yānti māmikām| kalpakṣaye punastāni kalpādau visṛjāmyaham||9.7||
sarvabhutani kaunteya prakritim yanti mamikam kalpakshaye punastani kalpadau visrijamyaham9.7
Meaning
At the end of each cosmic cycle, all beings merge into Krishna's nature. At the beginning of the next cycle, Krishna projects them forth again. Creation and dissolution follow an eternal rhythm.
हे कौन्तेय! कल्प के अन्त में समस्त भूत मेरी प्रकृति को प्राप्त होते हैं; और कल्प के प्रारम्भ में उनको मैं फिर रचता हूँ।
This is verse 7 of 34 in Chapter 9 (Raja Vidya Raja Guhya Yoga) of the Bhagavad Gita.