महाभारतः mahābhārataḥ - book-13, chapter-110, verse-15

सप्तर्षीणां सदा लोके सोऽप्सरोभिर्वसेत्सह ।
निवर्तनं च तत्रास्य त्रीणि पद्मानि वै विदुः ॥१५॥

15. saptarṣīṇāṁ sadā loke so'psarobhirvasetsaha ,
nivartanaṁ ca tatrāsya trīṇi padmāni vai viduḥ.

15. saptarṣīṇām sadā loke saḥ apsarobhiḥ vaset saha
nivartanam ca tatra asya trīṇi padmāni vai viduḥ

15. saḥ sadā saptarṣīṇām loke apsarobhiḥ saha vaset
ca tatra asya nivartanam trīṇi padmāni vai viduḥ

15. He shall always dwell in the realm of the seven sages (saptarṣis) alongside the Apsaras. Indeed, they know the extent of his stay there to be three padmas.

Words meanings summery:

• सप्तर्षीणाम् (saptarṣīṇām) - of the celestial seven sages (saptarṣis) (of the seven sages)

• सदा (sadā) - always, perpetually

• लोके (loke) - in the world, in the realm

• सः (saḥ) - he, that

• अप्सरोभिः (apsarobhiḥ) - with Apsaras, with celestial nymphs

• वसेत् (vaset) - should dwell, may live

• सह (saha) - with, together with

• निवर्तनम् (nivartanam) - the extent or duration of his stay (return, turning back, extent, duration)

• च (ca) - and

• तत्र (tatra) - there, in that place

• अस्य (asya) - his, of him, of this

• त्रीणि (trīṇi) - three

• पद्मानि (padmāni) - three padmas (a large unit of measure or time, generally 10^14) (lotuses, padmas (a large number or measure))

• वै (vai) - indeed, truly, surely

• विदुः (viduḥ) - they know

Words meanings and morphology

सप्तर्षीणाम् (saptarṣīṇām) - of the celestial seven sages (saptarṣis) (of the seven sages)

(noun)

Genitive, masculine, plural of saptarṣi

saptarṣi - the seven sages, identified with the constellation Ursa Major

Compound type : dvigu (sapta+ṛṣi)

• sapta – seven
  numeral
• ṛṣi – sage, seer, inspired poet
  noun (masculine)

सदा (sadā) - always, perpetually

(indeclinable)

लोके (loke) - in the world, in the realm

(noun)

Locative, masculine, singular of loka

loka - world, realm, space, people, vision

सः (saḥ) - he, that

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

अप्सरोभिः (apsarobhiḥ) - with Apsaras, with celestial nymphs

(noun)

Instrumental, feminine, plural of apsaras

apsaras - celestial nymph, a female spirit of the clouds and waters

वसेत् (vaset) - should dwell, may live

(verb)

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

Root: vas (class 1)

सह (saha) - with, together with

(indeclinable)

निवर्तनम् (nivartanam) - the extent or duration of his stay (return, turning back, extent, duration)

(noun)

Nominative, neuter, singular of nivartana

nivartana - returning, turning back, cessation, extent, duration, a measure of land

Derived from root √vṛt (to turn) with upasarga ni-

Prefix: ni

Root: vṛt (class 1)

च (ca) - and

(indeclinable)

तत्र (tatra) - there, in that place

(indeclinable)

अस्य (asya) - his, of him, of this

(pronoun)

Genitive, masculine, singular of idam

idam - this, this one, he, she, it

त्रीणि (trīṇi) - three

(adjective)

Nominative, neuter, plural of tri

tri - three

पद्मानि (padmāni) - three padmas (a large unit of measure or time, generally 10^14) (lotuses, padmas (a large number or measure))

(noun)

Nominative, neuter, plural of padma

padma - lotus, an immense number (10^14 or 10^12), a measure

वै (vai) - indeed, truly, surely

(indeclinable)

विदुः (viduḥ) - they know

(verb)

3rd person , plural, active, perfect (liṭ) of vid

Root: vid (class 2)