Skandapurana 16.2.52

16.2.52

rathaṃtarasya kalpasya vṛttāntamadhikṛtya ca ..
sāvarṇinā nāradāya kṛṣṇamāhātmyasaṃyutam ..
proktaṃ brahmavarāhasya caritaṃ varṇyate'tra ca ..52..

Taking as subject the narrative of the Rathaṃtara Kalpa, / spoken by Sāvarṇi to Nārada, accompanied by the māhātmya of Kṛṣṇa, / and the deed of the divine Boar is described here;