Skandapurana 16.131.10

16.131.10

yaḥ savyapāṇikamalāgranakhena devastatpaṃcamaṃ ca sahasaiva purātiruṣṭaḥ ..
brāhmaṃ śirastaruṇapadmanibhaṃ cakarta taṃ śaṃkaraṃ śaraṇadaṃ śaraṇaṃ vrajāmi ..7.1.131.10...

The god who, exceedingly enraged of old, suddenly severed with the tip of the claw of his left lotus hand / the fifth, Brahma-head that was like a fresh lotus—to that Śaṃkara, granter of refuge, I go for refuge. // 10