Shiva Purana
अरण्ये चापी गोष्ठे वा विचार्य्य स्थानमुत्तमम् ॥ स्थित्वाचम्य ततः पूर्व्वं कृत्वा मानसमञ्जरीम् ॥ ८७॥
Consider the best place in the forest or in a cowshed Standing and washing himself, he first performed the Manasamanjari.
english translation
araNye cApI goSThe vA vicAryya sthAnamuttamam ॥ sthitvAcamya tataH pUrvvaM kRtvA mAnasamaJjarIm ॥ 87॥
hk transliteration by Sanscript