Skandapurana 17.14.3

17.14.3

snātvā dhyātvā śivaṃ devaṃ manasā'cintayadyadā ..
tadā rudraḥ samāyātastrinetro vṛṣabhadhvajaḥ ..
maharṣe tava tuṣṭo'haṃ kiṃ karomi vadasva tat .. 3 ..

having bathed and meditated on God Śiva, when he contemplated him in his mind, / then Rudra arrived, the three-eyed god whose banner bears a bull: / “Great seer, I am pleased with you; tell me what I may do [for you].”