Skandapurana 5.273.83

5.273.83

tvayā punaḥ kumārgeṇa yadvrataṃ brāhmaṇena ca [.
śaivamārgaṃ samāsthāya tanmahāpātakaṃ kṛtam .. 83 ..

You, however, as a brahmin taking up a Śaiva path by a wrong course— / that vow you undertook was a great sin committed by you. [83]