Shiva Purana
रावण उवाच ॥ गत्वा मया तु कैलासे तपोर्थं च महामुने ॥ तत्रैव बहुकालं वै तपस्तप्तं सुदारुणम् ॥ ३८ ॥
Rāvaṇa said:— O great sage, after going to Kailāsa for penance, I performed a severe penance for a long time.
english translation
rAvaNa uvAca ॥ gatvA mayA tu kailAse taporthaM ca mahAmune ॥ tatraiva bahukAlaM vai tapastaptaM sudAruNam ॥ 38 ॥
hk transliteration by Sanscript