Shiva Purana
स्नानं कृत्वा तु गोकर्णे चन्द्रभालं समर्च्य च ॥ शिवलोकमवाप्नोति सत्यंसत्यं न संशयः ॥ ७ ॥
Taking the ceremonial ablution in Gokarṇa and worshipping the moon-crested Śiva, the devotee attains Śívaloka. True. It is true undoubtedly.
english translation
snAnaM kRtvA tu gokarNe candrabhAlaM samarcya ca ॥ zivalokamavApnoti satyaMsatyaM na saMzayaH ॥ 7 ॥
hk transliteration by Sanscript