CC Madhya 20.266
jagṛhe — accepted; pauruṣam rūpam — the form of the puruṣa incarnation; bhagavān — the Supreme Personality of Godhead; mahat-ādibhiḥ — with the material energy, etc.; sambhūtam — created; ṣoḍaśa — sixteen; kalam — elements; ādau — in the beginning; loka — of the material worlds; sisṛkṣayā — with a desire for the creation.
“ ‘In the beginning of the creation, the Lord expanded Himself in the form of the puruṣa incarnation, accompanied by all the ingredients of material creation. First He created the sixteen principal energies suitable for creation. This was for the purpose of manifesting the material universes.’
This is a quotation from Śrīmad-Bhāgavatam (1.3.1). For an explanation, refer to Ādi-līlā, chapter five, verse 84.