Caitanya-caritāmṛta 24.76
aham evāsam evāgre nānyad yat sad-asat-param paścād ahaṁ yad etac ca yo ’vaśiṣyeta so ’smy aham
[aham evaasam evaagre naanyad yat sad-asat-param pashchaad aham yad etach cha yo ’vashishyeta so ’smy aham]
Blended reading (Sanskrit + English inline)
aham evāsam evāgre nānyad yat sad-asat-param paścād ahaṁ yad etac ca yo ’vaśiṣyeta so ’smy aham
“ ‘Prior to the cosmic creation, only I exist, and no phenomena exist, either gross, subtle or primordial. After creation, only I exist in everything, and after annihilation only I remain eternally.’
Purport
This verse from Śrīmad-Bhāgavatam (2.9.33) was spoken by Lord Kṛṣṇa. For an explanation see Ādi-līlā 1.53.
— A.C. Bhaktivedanta Swami Prabhupāda
My note
Source: vedabase.io