Śrīmad-Bhāgavatam · Text 11.19.16
Who is speaking and story frame
आदावन्ते च मध्ये च सृज्यात् सृज्यं यदन्वियात् ।
पुनस्तत्प्रतिसङ्क्रामे यच्छिष्येत तदेव सत् ॥ १६ ॥
ādāv ante ca madhye ca
sṛjyāt sṛjyaṁ yad anviyāt
punas tat-pratisaṅkrāme
yac chiṣyeta tad eva sat
Commencement, termination and maintenance are the stages of material causation. That which consistently accompanies all these material phases from one creation to another and remains alone when all material phases are annihilated is the one eternal.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.