SB 12.4.34
yadaivam etena viveka-hetina
maya-mayahankaranatma-bandhanam
chittvacyutatmanubhavo ’vatisthate
tam ahur atyantikam anga samplavam
Translation:
My dear Pariksit, when the illusory false ego that binds the soul has been cut off with the sword of discriminating knowledge and one has developed realization of Lord Acyuta, the Supreme Soul, this is called the atyantika, or ultimate, annihilation of material existence.