Thirty Minor Upanishads
Chapters
Thirty Minor Upanishads: 21. Naraḍaparivrājaka...

"At the time of the sannyāsa, the recitation of the Veḍas should be made till the mind is cleared; and after casting aside in water the waist-cord, loin-cloth, staff, cloth, bowl, etc., he should roam about. He should be without even the slightest tattered cloth. He should neither utter anything other than Praṇava, nor talk nor hear. He should not study logic or grammar. He should not talk many words; they will but pain his vocal organ. He should not converse with people through the vocal organ. He should not talk in other language (than Samskṛṭ). He has no worship of God and no witnessing of festivals; he should be free from pilgrimage. The other rules of ascetics are: The kutīchaka should beg alms in one house only; for the bahūḍaka, eight morsels in eight houses; for the hamsa, there is no limit; for paramahamsa, he should beg with his hand as the vessel in five houses; for the ṭurīyāṭiṭa, he should eat fruits with his mouth like cows; (for avaḍhūṭa), he should take food like a boa constrictor in all castes. The ascetic should not dwell in one place for many days. He should not make prostrations to any one. Among the ṭurīyāṭiṭa and avaḍhūṭa (ascetics), even though one is junior, he should not make prostrations to another, a senior who has known the Reality. He should not swim with his hands and cross the river. He should not climb up a tree, nor get into a carriage. Nothing should be purchased or sold (by him). No exchange should be made, no ostentation for him. There is nothing for the ascetic to do. If there is anything for him to do, he will perish. Therefore the only thing he is qualified to do is reflection, etc.

"To the āṭuras and kutīchakas, the world they attain is bhūrloka and bhuvarloka; to the bāhūḍakas, swargaloka; to the hamsas, ṭapoloka; to the paramahamsas, saṭyaloka. To the ṭurīyāṭīṭa and avaḍhūṭa, Kaivalya in Āṭmā according to the analogy of the wasp and the worm through the realisation of Reality. It is the command of the Veḍas that whatever form one thinks of at the last (death) moment and before leaving the body is attained by him and no other. Knowing it thus, he should not be a practiser of anything but the realisation of Reality.