SB 12.10.41
etat kecid avidvamso
maya-samsrtir atmanah
anady-avartitam nrnam
kadacitkam pracaksate
Translation:
Although this event was unique and unprecedented, some unintelligent persons compare it to the cycle of illusory material existence the Supreme Lord has created for the conditioned souls — an endless cycle that has been continuing since time immemorial.
Purport:
Markandeya’s being drawn into the Lord’s body by His inhalation and expelled again by His exhalation should not be considered a symbolic description of the perennial cycles of material creation and annihilation. This portion of the Srimad-Bhagavatam describes a real, historical event experienced by a great devotee of the Lord, and those trying to relegate this story to mere symbolic allegory are here declared to be unintelligent fools.