Skandapurana 16.21.75

16.21.75

eṣāṃ śāpo mayā datto'nugrahīṣya ti śaṃkaraḥ..
nānyastrātuṃ bhavecchakto vinā paśupatiṃ bhavam ..
tattvaṃ śīghrataraṃ gaccha samārādhaya śaṃkara .. 75 ..

A curse was given to these by me, [and] Śaṃkara will bestow his grace. / No other could be able to protect [you], except Bhava, Paśupati. / Therefore go very quickly [and] worship Śaṃkara.