Thereafter, influenced by the interactions of eternal time, the supreme sum total of matter, called the mahat-tattva, became manifested, and in this mahat-tattva the unalloyed goodness, the Supreme Lord, sowed the seeds of universal manifestation out of His own body.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ततोऽभवन्महत्तत्त्वमव्यक्तात्कालचोदितात् । विज्ञानात्माऽऽत्मदेहस्थं विश्वं व्यञ्जंस्तमोनुदः
tato'bhavanmahattattvamavyaktātkālacoditāt | vijñānātmā''tmadehasthaṃ viśvaṃ vyañjaṃstamonudaḥ
SB 3.5.27