महाभारतः mahābhārataḥ - book-9, chapter-54, verse-6

तस्मिन्महापुण्यतमे त्रैलोक्यस्य सनातने ।
संग्रामे निधनं प्राप्य ध्रुवं स्वर्गो भविष्यति ॥६॥

6. tasminmahāpuṇyatame trailokyasya sanātane ,
saṁgrāme nidhanaṁ prāpya dhruvaṁ svargo bhaviṣyati.

6. tasmin mahāpuṇyatame trailokyasya sanātane saṅgrāme
nidhanam prāpya dhruvam svargaḥ bhaviṣyati

6. tasmin mahāpuṇyatame trailokyasya sanātane saṅgrāme
nidhanam prāpya dhruvam svargaḥ bhaviṣyati

6. In that supremely sacred, everlasting battle (saṅgrāma) of the three worlds, certainly, one who attains death will achieve heaven.

Words meanings summery:

• तस्मिन् (tasmin) - in that (battle) (in that, in it)

• महापुण्यतमे (mahāpuṇyatame) - in the most sacred (battle) (in the most greatly meritorious, in the most sacred)

• त्रैलोक्यस्या (trailokyasyā) - of the three worlds

• सनातने (sanātane) - in the everlasting (battle) (in the eternal, in the ancient, in the everlasting)

• सङ्ग्रामे (saṅgrāme) - in the battle (in the battle, in the war)

• निधनम् (nidhanam) - death (death, destruction, end)

• प्राप्य (prāpya) - having attained (having obtained, having reached, having attained)

• ध्रुवम् (dhruvam) - certainly (certainly, surely, fixed, firm)

• स्वर्गः (svargaḥ) - heaven (heaven, paradise)

• भविष्यति (bhaviṣyati) - will be (will be, will become, will exist)

Words meanings and morphology

तस्मिन् (tasmin) - in that (battle) (in that, in it)

(pronoun)

Locative, masculine, singular of tad

tad - that, he, she, it

Masculine/Neuter locative singular form of the demonstrative pronoun 'tad'.

महापुण्यतमे (mahāpuṇyatame) - in the most sacred (battle) (in the most greatly meritorious, in the most sacred)

(adjective)

Locative, masculine, singular of mahāpuṇyatama

mahāpuṇyatama - most greatly meritorious, most sacred, most virtuous, most auspicious

Superlative degree of 'mahāpuṇya' (great merit).

Compound type : karmadhāraya (mahā+puṇyatama)

• mahā – great, large, mighty, excellent
  adjective (masculine)
• puṇyatama – most sacred, most meritorious
  adjective (masculine)
  Superlative of 'puṇya' (meritorious, sacred).

त्रैलोक्यस्या (trailokyasyā) - of the three worlds

(noun)

Genitive, neuter, singular of trailokya

trailokya - the three worlds (heaven, earth, and the lower regions, or atmosphere)

Compound of 'tri' (three) and 'loka' (world).

Compound type : dvigu (tri+loka)

• tri – three
  numeral
• loka – world, realm, people
  noun (masculine)

सनातने (sanātane) - in the everlasting (battle) (in the eternal, in the ancient, in the everlasting)

(adjective)

Locative, masculine, singular of sanātana

sanātana - eternal, ancient, perpetual, primeval, traditional

Derived from 'sadā' (always) with the suffix '-tana'.

सङ्ग्रामे (saṅgrāme) - in the battle (in the battle, in the war)

(noun)

Locative, masculine, singular of saṅgrāma

saṅgrāma - battle, war, combat, conflict, encounter

Derived from the root 'grām' (to go, to fight) with the prefix 'sam-'.

Prefix: sam

Root: grām

निधनम् (nidhanam) - death (death, destruction, end)

(noun)

Accusative, neuter, singular of nidhana

nidhana - death, destruction, end, loss, cessation

Derived from the root 'dhā' (to place, to put) with the prefix 'ni-'.

Prefix: ni

Root: dhā (class 3)

प्राप्य (prāpya) - having attained (having obtained, having reached, having attained)

(indeclinable)

Absolutive (Gerund)

Formed from the root 'āp' (to obtain) with the prefix 'pra-' and the suffix '-ya'.

Prefix: pra

Root: āp (class 5)

ध्रुवम् (dhruvam) - certainly (certainly, surely, fixed, firm)

(indeclinable)

Derived from the root 'dhru' (to be firm).

Root: dhru (class 1)

स्वर्गः (svargaḥ) - heaven (heaven, paradise)

(noun)

Nominative, masculine, singular of svarga

svarga - heaven, paradise, abode of gods, celestial region, felicity

Derived from 'su' (good) and root 'gam' (to go).

Root: gam (class 1)

भविष्यति (bhaviṣyati) - will be (will be, will become, will exist)

(verb)

3rd person , singular, active, future (lṛṭ) of bhū

Future (Lṛṭ)

3rd person singular, active voice, future tense form.

Root: bhū (class 1)