Shiva Purana
वस्त्रेणाच्छाद्य मतिमाञ्छिरो नासिकया सह॥ विशोध्य देहं वि धिवत्तृणमाधाय भूतले ॥ १०॥
The intelligent devotee shall cover the head along with the nose with a piece of cloth. He shall spread some grass on the ground and evacuate his bowels there duly.
english translation
vastreNAcchAdya matimAJchiro nAsikayA saha॥ vizodhya dehaM vi dhivattRNamAdhAya bhUtale ॥ 10॥
hk transliteration by Sanscript