महाभारतः mahābhārataḥ - book-3, chapter-83, verse-25

तत्रेशानं समभ्यर्च्य त्रिरात्रोपोषितो नरः ।
दशाश्वमेधमाप्नोति गाणपत्यं च विन्दति ।
उष्य द्वादशरात्रं तु कृतात्मा भवते नरः ॥२५॥

25. tatreśānaṁ samabhyarcya trirātropoṣito naraḥ ,
daśāśvamedhamāpnoti gāṇapatyaṁ ca vindati ,
uṣya dvādaśarātraṁ tu kṛtātmā bhavate naraḥ.

25. tatra īśānam samabhyarcya
trirātropoṣitaḥ naraḥ daśāśvamedham āpnoti
gāṇapatyam ca vindati uṣya
dvādaśarātram tu kṛtātmā bhavate naraḥ

25. tatra naraḥ īśānam samabhyarcya
trirātropoṣitaḥ daśāśvamedham āpnoti
ca gāṇapatyam vindati tu
dvādaśarātram uṣya kṛtātmā bhavate naraḥ

25. There, a person who has worshipped Īśāna and fasted for three nights attains the merit of ten horse-Vedic rituals (aśvamedha) and achieves the state of a Gaṇapati. Moreover, by residing there for twelve nights, that person indeed becomes a perfected being (kṛtātman).

Words meanings summery:

• तत्र (tatra) - there (there, in that place)

• ईशानम् (īśānam) - Īśāna (Lord Shiva) (Īśāna (a name of Lord Shiva))

• समभ्यर्च्य (samabhyarcya) - having worshipped (well) (having worshipped well, having venerated)

• त्रिरात्रोपोषितः (trirātropoṣitaḥ) - having fasted for three nights (having fasted for three nights, one who has fasted for three nights)

• नरः (naraḥ) - a person (a man, a person)

• दशाश्वमेधम् (daśāśvamedham) - the merit of ten horse-Vedic rituals (aśvamedha) (ten horse-Vedic rituals)

• आप्नोति (āpnoti) - attains (he obtains, he reaches, he attains)

• गाणपत्यम् (gāṇapatyam) - the state of being a Gaṇapati (leader of Gaṇas, attendant of Shiva) (the state of being a Gaṇapati, leadership of Gaṇas)

• च (ca) - and (and, also)

• विन्दति (vindati) - achieves (he finds, he obtains, he gains)

• उष्य (uṣya) - by residing (there) (having dwelt, having resided, having lived)

• द्वादशरात्रम् (dvādaśarātram) - for twelve nights

• तु (tu) - moreover, indeed (but, indeed, however, moreover)

• कृतात्मा (kṛtātmā) - a perfected being (kṛtātman) (a perfected soul, one whose self is made, one who has accomplished (spiritual goals))

• भवते (bhavate) - becomes (he becomes, he is)

• नरः (naraḥ) - that person (a man, a person)

Words meanings and morphology

तत्र (tatra) - there (there, in that place)

(indeclinable)

locative of tad (that)

ईशानम् (īśānam) - Īśāna (Lord Shiva) (Īśāna (a name of Lord Shiva))

(proper noun)

Accusative, masculine, singular of īśāna

īśāna - lord, ruler, name of Shiva

from root √īś (to rule, to be master)

Root: √īś (class 2)

समभ्यर्च्य (samabhyarcya) - having worshipped (well) (having worshipped well, having venerated)

(indeclinable)

absolutive

from root √arc (to honor, worship) with prefixes sam (well, completely) + abhi (towards)

Prefixes: sam+abhi

Root: √arc (class 1)

त्रिरात्रोपोषितः (trirātropoṣitaḥ) - having fasted for three nights (having fasted for three nights, one who has fasted for three nights)

(adjective)

Nominative, masculine, singular of trirātropoṣita

trirātropoṣita - one who has fasted for three nights

bahuvrīhi compound of tri (three) + rātra (night) + upoṣita (fasted)

Compound type : bahuvrīhi (tri+rātra+upoṣita)

• tri – three
  numeral (masculine)
• rātra – night
  noun (neuter)
• upoṣita – fasted, having fasted
  adjective (masculine)
  past passive participle
  from root √vas (to dwell) with prefix upa and then causative/denominative, then participle ending. Or from √uṣ (to burn) / √vas (to wear, dwell). More commonly from upa + √vas meaning to fast/abstain.
  Prefix: upa
  Root: √vas (class 1)

Note: modifies naraḥ

नरः (naraḥ) - a person (a man, a person)

(noun)

Nominative, masculine, singular of nara

nara - man, person, hero

दशाश्वमेधम् (daśāśvamedham) - the merit of ten horse-Vedic rituals (aśvamedha) (ten horse-Vedic rituals)

(noun)

Accusative, masculine, singular of daśāśvamedha

daśāśvamedha - ten horse-Vedic rituals

compound of daśa (ten) + aśvamedha (horse-Vedic ritual)

Compound type : dvigu (daśa+aśvamedha)

• daśa – ten
  numeral
• aśvamedha – horse-Vedic ritual, a specific type of Vedic ritual (yajña) for imperial sovereignty
  noun (masculine)
  compound of aśva (horse) + medha (Vedic ritual, sacrifice)

आप्नोति (āpnoti) - attains (he obtains, he reaches, he attains)

(verb)

3rd person , singular, active, present (laṭ) of √āp

present tense, 3rd person singular

from root √āp (to obtain)

Root: √āp (class 5)

गाणपत्यम् (gāṇapatyam) - the state of being a Gaṇapati (leader of Gaṇas, attendant of Shiva) (the state of being a Gaṇapati, leadership of Gaṇas)

(noun)

Accusative, neuter, singular of gāṇapatya

gāṇapatya - state of being a Gaṇapati, leadership of the Gaṇas, the office of Gaṇeśa

derived from Gaṇapati (lord of Gaṇas, Ganesha) with suffix -ya indicating 'state of being'

च (ca) - and (and, also)

(indeclinable)

विन्दति (vindati) - achieves (he finds, he obtains, he gains)

(verb)

3rd person , singular, active, present (laṭ) of √vid

present tense, 3rd person singular

from root √vid (class 6)

Root: √vid (class 6)

उष्य (uṣya) - by residing (there) (having dwelt, having resided, having lived)

(indeclinable)

absolutive

from root √vas (to dwell, reside)

Root: √vas (class 1)

द्वादशरात्रम् (dvādaśarātram) - for twelve nights

(noun)

Accusative, neuter, singular of dvādaśarātra

dvādaśarātra - period of twelve nights

compound of dvādaśa (twelve) + rātra (night)

Compound type : dvigu (dvādaśa+rātra)

• dvādaśa – twelve
  numeral
• rātra – night
  noun (neuter)

Note: Adverbial accusative of duration.

तु (tu) - moreover, indeed (but, indeed, however, moreover)

(indeclinable)

कृतात्मा (kṛtātmā) - a perfected being (kṛtātman) (a perfected soul, one whose self is made, one who has accomplished (spiritual goals))

(noun)

Nominative, masculine, singular of kṛtātman

kṛtātman - a perfected soul, one whose self is accomplished, one who has achieved spiritual purity

bahuvrīhi compound of kṛta (made, done, accomplished) + ātman (self, soul)

Compound type : bahuvrīhi (kṛta+ātman)

• kṛta – done, made, accomplished, created
  adjective (neuter)
  past passive participle
  from root √kṛ (to do, make)
  Root: √kṛ (class 8)
• ātman – self, soul, spirit, essence
  noun (masculine)

Note: Predicative nominative with bhavate.

भवते (bhavate) - becomes (he becomes, he is)

(verb)

3rd person , singular, middle, present (laṭ) of √bhū

present tense, 3rd person singular

from root √bhū (to be), in the Ātmanepada form

Root: √bhū (class 1)

Note: Ātmanepada form of √bhū.

नरः (naraḥ) - that person (a man, a person)

(noun)

Nominative, masculine, singular of nara

nara - man, person, hero

Note: Subject of the verb 'bhavate'.