Bhagavatapurana 11.24.2

11.24.2

āsīj jñānam atho artha ekam evāvikalpitam /
yadā viveka-nipuṇā ādau kṛta-yuge 'yuge //

2. In the beginning, before yugas began to run, and in the Kritayuga, and when people were strong in discrimination, there was but one thing without difference, the perfect consciousness (seer) and all the objective existence being one and the same and absorbed in Brahman).