Skanda Purana 16.259.9

16.259.9

parṇādo'pi sthitastatra tasyārādhanatatparaḥ ..
tatra bhādrapade māse ṣaṣṭhyāṃ snānaṃ samācaret ..
parṇādityaṃ tataḥ paśyenna sa duḥkhamavāpnuyāt .. 9 ..

Parṇāda too remained there, intent upon his worship.
There, in the month of Bhādrapada, on the sixth lunar day, one should perform ritual ablution;
then one should view Parṇāditya—he would not suffer distress.