Shiva Purana
शेते लोकविनाशाय तप आस्थाय दारुणम् ॥ संवत्सरस्य पर्यन्ते स निश्वासं विमुंचति॥ १६॥
He stays there performing a terrible penance for the destruction of the worlds. At the end of every year he exhales terribly.
english translation
zete lokavinAzAya tapa AsthAya dAruNam ॥ saMvatsarasya paryante sa nizvAsaM vimuMcati॥ 16॥
hk transliteration by Sanscript