Skandapurana 1.3.31.80

1.3.31.80

pañcamī nāgarājasya kumārasya ca ṣaṣṭhikā..
bhānośca saptamī jñeyā navamī caṇḍikāpriyā.. 33.80 ..

the fifth to the king of nāgas, and the sixth to Kumāra; / the seventh should be known as belonging to the sun, and the ninth is dear to Caṇḍikā;