Manava Dharmashastra 6.26

6.26

sukhaprayojaneṣu vastuṣu prayatnaṃ na kuryāt | ātapapīḍitaḥ chāyāṃ nopasarpet | śītārdito nāgniṃ samindhīta | yadi tu daivopapāditādityatāpādinā śītādiduḥkhanivṛttirbhavatītyatraiva duḥkhāpanodaḥ kriyate, na niṣidhyate | varṣādikālādanyatraitadvidhīyate | tatra pratipannasya dharmasya vidhānāt | athavā vyādhitastasyauṣadhaprayatno nivāryate | vyādhinivṛttirapi 'sukhaṃ' ucyate | atastannivṛttyarthaṃ yatnaṃ na kuryāt | dharāśayaḥ kevalaistṛṇairācchādite sthaṇḍile śayīta | śaraṇeṣvāśrayeṣu gṛhavṛkṣamūlādiṣu mamakāramātmīyābhiniveśaṃ na kuryāt | vṛkṣamūlāni niketanaṃ gṛhasthānīyaṃ kuryāt | tadasambhave śilātalaguhādayo'pi vihitāḥ |

Medhātithi’s commentary (manubhāṣya):
He shall make no effort to obtain things that give pleasure; e.g., troubled by heat, he shall not move into the shade, and troubled by cold, he shall not kindle fire. If, however, his sufferings are removed by such natural causes as the falling of the sun’s rays and the like,—this is not forbidden. This rule refers to seasons other than the rains; because special rules have been prescribed with special reference to this latter Reason.

Or, the text may be taken as prohibiting the use of medicines by the hermit if he happen to fall ill,—being cured of disease also being a kind of ‘pleasure;’ hence he shall not make any effort to secure this pleasure.

‘Sleeping on the ground’;—i.e., he shall sleep on the ground, covered only with grass.

‘Shelter’— dwelling-places, such as houses, tree-roots and so forth;—for these he shall not care; he shall not have any hankering after the possession of these.

He shall make the roots of trees his dwelling. In the event of their being not available, stone-slabs, mountain-caves and such places have also been ordained for him.—(26).