My dear Parīkṣit, 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 ātyantika, or ultimate, annihilation of material existence.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यदैवमेतेन विवेकहेतिना मायामयाहङ्करणात्मबन्धनम् । छित्त्वाच्युतात्मानुभवोऽवतिष्ठते तमाहुरात्यन्तिकमङ्ग सम्प्लवम्
yadaivametena vivekahetinā māyāmayāhaṅkaraṇātmabandhanam | chittvācyutātmānubhavo'vatiṣṭhate tamāhurātyantikamaṅga samplavam
SB 12.4.34