Bhagavatapurana 5.8.28

5.8.28

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tatrāpi ha vā ātmano mṛgatva-kāraṇaṃ bhagavad-ārādhana-samīhānubhāvenānusmṛtya bhṛśam anutapyamāna āha //

28. Though he was in that life, he remembered the cause of his birth as a deer by virtue of his endeavours (in his previous life) to worship Hari and in great distress he says.