महाभारतः mahābhārataḥ - book-13, chapter-131, verse-43

गोब्राह्मणहितार्थाय रणे चाभिमुखो हतः ।
त्रेताग्निमन्त्रपूतं वा समाविश्य द्विजो भवेत् ॥४३॥

43. gobrāhmaṇahitārthāya raṇe cābhimukho hataḥ ,
tretāgnimantrapūtaṁ vā samāviśya dvijo bhavet.

43. go-brāhmaṇa-hitārthāya raṇe ca abhimukhaḥ hataḥ
tretāgnimantrapūtam vā samāviśya dvijaḥ bhavet

43. raṇe go-brāhmaṇa-hitārthāya abhimukhaḥ ca hataḥ
vā tretāgnimantrapūtam samāviśya dvijaḥ bhavet

43. One who is killed while facing the enemy in battle for the welfare of cows and brahmins, or one who has become purified by the mantras of the three (Vedic) fires, becomes a twice-born (dvija).

Words meanings summery:

• गो-ब्राह्मण-हितार्थाय (go-brāhmaṇa-hitārthāya) - for the welfare of cows and brahmins

• रणे (raṇe) - in battle; on the battlefield

• च (ca) - and; also; moreover

• अभिमुखः (abhimukhaḥ) - facing the enemy (facing; confronted; turned towards)

• हतः (hataḥ) - killed; struck; slain

• त्रेताग्निमन्त्रपूतम् (tretāgnimantrapūtam) - purified by the mantras of the three fires

• वा (vā) - or; either

• समाविश्य (samāviśya) - having attained the state of being purified (having entered; having approached; having attained)

• द्विजः (dvijaḥ) - a brahmin (metaphorically, in the context of achieving higher spiritual status) (twice-born; brahmin; bird)

• भवेत् (bhavet) - should become; may become

Words meanings and morphology

गो-ब्राह्मण-हितार्थाय (go-brāhmaṇa-hitārthāya) - for the welfare of cows and brahmins

(noun)

Dative, masculine, singular of go-brāhmaṇa-hitārtha

go-brāhmaṇa-hitārtha - for the welfare of cows and brahmins; for the benefit of cattle and brahmins

Compound type : tatpuruṣa (go+brāhmaṇa+hita+artha)

• go – cow; bull; earth; ray of light
  noun (feminine)
• brāhmaṇa – brahmin; a member of the priestly class
  noun (masculine)
• hita – welfare; benefit; good
  noun (neuter)
  Past Passive Participle
  from root DHĀ (to place, to put)
  Root: dhā (class 3)
• artha – purpose; meaning; wealth; object
  noun (masculine)

Note: Compound word, dative singular.

रणे (raṇe) - in battle; on the battlefield

(noun)

Locative, masculine, singular of raṇa

raṇa - battle; fight; war

Root: raṇ (class 1)

च (ca) - and; also; moreover

(indeclinable)

अभिमुखः (abhimukhaḥ) - facing the enemy (facing; confronted; turned towards)

(adjective)

Nominative, masculine, singular of abhimukha

abhimukha - facing; confronted; turned towards

Compound type : tatpuruṣa (abhi+mukha)

• abhi – towards; against; over
  indeclinable
• mukha – face; mouth; front
  noun (neuter)

हतः (hataḥ) - killed; struck; slain

(adjective)

Nominative, masculine, singular of hata

hata - killed; struck; slain

Past Passive Participle

from root HAN (to strike, to kill)

Root: han (class 2)

त्रेताग्निमन्त्रपूतम् (tretāgnimantrapūtam) - purified by the mantras of the three fires

(adjective)

neuter, singular of tretāgnimantrapūta

tretāgnimantrapūta - purified by the mantras of the three sacred fires

Compound type : tatpuruṣa (tretāgni+mantra+pūta)

• tretāgni – the three sacred fires (Gārhapatya, Āhavanīya, Dakṣiṇāgni)
  noun (masculine)
• mantra – sacred utterance; hymn; chant
  noun (masculine)
  Root: man (class 4)
• pūta – purified; cleansed; holy
  adjective (neuter)
  Past Passive Participle
  from root PŪ (to purify)
  Root: pū (class 1)

Note: Adjective modifying an implied subject that would become dvijaḥ.

वा (vā) - or; either

(indeclinable)

समाविश्य (samāviśya) - having attained the state of being purified (having entered; having approached; having attained)

(indeclinable)

Absolutive (Gerund)

from root VIŚ (to enter) with upasargas SAM and Ā

Prefixes: sam+ā

Root: viś (class 6)

द्विजः (dvijaḥ) - a brahmin (metaphorically, in the context of achieving higher spiritual status) (twice-born; brahmin; bird)

(noun)

Nominative, masculine, singular of dvija

dvija - twice-born; brahmin; bird; tooth

from dvi (two) and ja (born)

Compound type : bahuvrīhi (dvi+jan)

• dvi – two
  numeral
• jan – to be born; to produce
  verb
  Root: jan (class 4)

Note: Refers to the status of a brahmin or one initiated into Vedic studies.

भवेत् (bhavet) - should become; may become

(verb)

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

Root: bhū (class 1)

Note: Expresses potentiality or command.