Shiva Purana
रुद्रलोकमनुप्राप्य रुद्रेण सह मोदते ॥ ततस्सायुज्यमाप्नोति शिवस्य कृपया मुने ॥ ४७ ॥
O sage, after attaining Rudra’s region he rejoices with Rudra. Then he becomes one with Rudra by the mercy of Śiva.
english translation
rudralokamanuprApya rudreNa saha modate ॥ tatassAyujyamApnoti zivasya kRpayA mune ॥ 47 ॥
hk transliteration by Sanscript