Manusmriti
अप्रयत्नः सुखार्थेषु ब्रह्मचारी धराऽऽशयः । शरणेष्वममश्चैव वृक्षमूलनिकेतनः ॥ २६ ॥
Making no effort (to procure) things that give pleasure, chaste, sleeping on the bare ground, not caring for any shelter, dwelling at the roots of trees.
english translation
aprayatnaH sukhArtheSu brahmacArI dharA''zayaH । zaraNeSvamamazcaiva vRkSamUlaniketanaH ॥ 26 ॥
hk transliteration by Sanscript