महाभारतः mahābhārataḥ - book-12, chapter-36, verse-34

अहःसु सततं तिष्ठेदभ्याकाशं निशि स्वपेत् ।
त्रिरह्नस्त्रिर्निशायाश्च सवासा जलमाविशेत् ॥३४॥

34. ahaḥsu satataṁ tiṣṭhedabhyākāśaṁ niśi svapet ,
trirahnastrirniśāyāśca savāsā jalamāviśet.

34. ahaḥsu satatam tiṣṭhet abhyākāśam niśi svapet
triḥ ahnaḥ triḥ niśāyāḥ ca savāsāḥ jalam āviśet

34. ahaḥsu satatam abhyākāśam tiṣṭhet niśi svapet
ca ahnaḥ triḥ niśāyāḥ triḥ savāsāḥ jalam āviśet

34. One should always remain standing under the open sky during the day and sleep there at night. Thrice during the day and thrice at night, one should enter the water fully clothed.

Words meanings summery:

• अहःसु (ahaḥsu) - during the days

• सततम् (satatam) - constantly, always, perpetually

• तिष्ठेत् (tiṣṭhet) - one should stand, one should remain

• अभ्याकाशम् (abhyākāśam) - under the open sky, towards the sky

• निशि (niśi) - at night

• स्वपेत् (svapet) - one should sleep

• त्रिः (triḥ) - thrice, three times

• अह्नः (ahnaḥ) - of the day, during the day

• त्रिः (triḥ) - thrice, three times

• निशायाः (niśāyāḥ) - of the night, during the night

• च (ca) - and

• सवासाः (savāsāḥ) - clothed, with clothes on

• जलम् (jalam) - water

• आविशेत् (āviśet) - one should enter

Words meanings and morphology

अहःसु (ahaḥsu) - during the days

(noun)

Locative, neuter, plural of ahan

ahan - day, daylight

सततम् (satatam) - constantly, always, perpetually

(indeclinable)

Often used adverbially in accusative singular neuter.

Note: Used adverbially.

तिष्ठेत् (tiṣṭhet) - one should stand, one should remain

(verb)

3rd person , singular, active, optative (vidhiliṅ) of sthā

Root: sthā (class 1)

अभ्याकाशम् (abhyākāśam) - under the open sky, towards the sky

(indeclinable)

Adverbial use, often from Avyayībhāva compound.

Compound type : Avyayībhāva (abhi+ākāśa)

• abhi – towards, near, against
  indeclinable
  Preposition or verbal prefix.
• ākāśa – sky, space, ether
  noun (masculine)

Note: Functions adverbially.

निशि (niśi) - at night

(noun)

Locative, feminine, singular of niś

niś - night

स्वपेत् (svapet) - one should sleep

(verb)

3rd person , singular, active, optative (vidhiliṅ) of svap

Root: svap (class 2)

त्रिः (triḥ) - thrice, three times

(indeclinable)

अह्नः (ahnaḥ) - of the day, during the day

(noun)

Genitive, neuter, singular of ahan

ahan - day

त्रिः (triḥ) - thrice, three times

(indeclinable)

निशायाः (niśāyāḥ) - of the night, during the night

(noun)

Genitive, feminine, singular of niśā

niśā - night

च (ca) - and

(indeclinable)

सवासाः (savāsāḥ) - clothed, with clothes on

(adjective)

Nominative, masculine, singular of savāsas

savāsas - clothed, having clothes

Compound type : Bahuvrīhi (saha+vāsas)

• saha – with, together with
  indeclinable
  Preposition or prefix meaning 'with'.
• vāsas – garment, clothes, dwelling
  noun (neuter)
  Root: vas (class 1)

जलम् (jalam) - water

(noun)

Accusative, neuter, singular of jala

jala - water

आविशेत् (āviśet) - one should enter

(verb)

3rd person , singular, active, optative (vidhiliṅ) of viś

Prefix: ā

Root: viś (class 6)