Shiva Purana
देहदौर्बल्यवशतो यद्यधैर्य्यधरो यतिः ॥ अकामश्च शिवं स्मृत्वा स जीर्णां स्वां तनुं त्यजेत् ॥ १२ ॥
If he is devoid of courage due to physical weakness, he shall remember Śiva with specific desires and cast off his worn-out body.
english translation
dehadaurbalyavazato yadyadhairyyadharo yatiH ॥ akAmazca zivaM smRtvA sa jIrNAM svAM tanuM tyajet ॥ 12 ॥
hk transliteration by Sanscript