Bhagavatapurana 8.17.23

8.17.23

praviṣṭamātmani hareraṃśaṃ hy avitathekṣaṇaḥ /
so 'dityāṃ vīryamādhatta tapasā cirasambhṛtam /
amāhitamanā rājan dāruṇy agniṃ yathānilaḥ //

23. With his mind kept in perfect serenity the sage of true insight placed his power (seed) conserved through long Tapas, (the Amsa of Hari really entered into him), in Aditi, just as Vayu places fire in a piece of wood.