Bhagavatapurana 5.2.2

5.2.2

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sa ca kadācit pitṛloka-kāmaḥ sura-vara-vanitākrīḍācala-droṇyāṃ bhagavantaṃ viśva-sṛjāṃ patim ābhṛta-paricaryopakaraṇa ātma ikāgryeṇa tapasvy ārādhayāṃ babhūva //

2. And on one occasion Agnidhra desirous of attaining to Pitriloka (*i.e.*, of having issue) began to perform Tapas in the hollow of a mountain (Mandara) which was the sporting ground of celestial damsels, and having collected all the things necessary for worship, with concentration of mind, propitiated the glorious Brahma, the Lord of Progenitors of the world.