Bhagavatapurana 5.9.20

5.9.20

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na vā etad viṣṇudatta mahad-adbhutaṃ yad asambhramaḥ sva-śiraś-chedana āpatite 'pi vimukta-dehādy-ātma-bhāva-sudṛḍha-hṛdaya-granthīnāṃ sarva-sattva-suhṛd-ātmanāṃ nirvairāṇāṃ sākṣād bhagavatānimiṣāri-varāyudhenāpramattena tais tair bhāvaiḥ parirakṣyamāṇānāṃ tat-pāda-mūlam akutaścid-bhayam upasṛtānāṃ bhāgavata-paramahaṃsānām //

20. O Parikshit, thou art thyself indebted to Sri Krishna for thy life. It is no great wonder that, even when their head is chopped off, no perturbation is seen on the part of Paramahamsas devoted to the supreme Lord Hari, who have ceased to mistake the body for Atman and have cut off the strong knot of the heart (attachment) and who have taken shelter at the Lord's feet, the resort of absolute security, who by nature are friends of all beings and hate none, and who are protected (directly) by the Lord who is in various forms, ever on the alert with His foremost weapon, namely, the Chakra of Time.