महाभारतः mahābhārataḥ - book-13, chapter-130, verse-43

अग्नियोगवहो ग्रीष्मे विधिदृष्टेन कर्मणा ।
चीर्त्वा द्वादश वर्षाणि राजा भवति पार्थिवः ॥४३॥

43. agniyogavaho grīṣme vidhidṛṣṭena karmaṇā ,
cīrtvā dvādaśa varṣāṇi rājā bhavati pārthivaḥ.

43. agni-yoga-vahaḥ grīṣme vidhi-dṛṣṭena karmaṇā
cīrtvā dvādaśa varṣāṇi rājā bhavati pārthivaḥ

43. yaḥ grīṣme vidhi-dṛṣṭena karmaṇā agni-yoga-vahaḥ
dvādaśa varṣāṇi cīrtvā saḥ rājā pārthivaḥ bhavati

43. He who practices the discipline (yoga) of fire in summer, through actions (karma) prescribed by rule, having observed this for twelve years, becomes an earthly king (pārthivaḥ).

Words meanings summery:

• अग्नि-योग-वहः (agni-yoga-vahaḥ) - one who practices the discipline of fire, bearing fire austerity

• ग्रीष्मे (grīṣme) - in summer, during the summer season

• विधि-दृष्टेन (vidhi-dṛṣṭena) - by what is prescribed by rule, according to prescribed rules

• कर्मणा (karmaṇā) - by action, by deed, by ritual

• चीर्त्वा (cīrtvā) - having performed, having practiced, having observed

• द्वादश (dvādaśa) - twelve

• वर्षाणि (varṣāṇi) - years, rainy seasons

• राजा (rājā) - king, ruler

• भवति (bhavati) - becomes, is, happens

• पार्थिवः (pārthivaḥ) - earthly, a king, ruler, prince

Words meanings and morphology

अग्नि-योग-वहः (agni-yoga-vahaḥ) - one who practices the discipline of fire, bearing fire austerity

(adjective)

Nominative, masculine, singular of agniyogavaha

agniyogavaha - practicing or bearing the discipline/austerity of fire

Compound type : tatpuruṣa (agni+yoga+vaha)

• agni – fire, Agni (god of fire)
  noun (masculine)
• yoga – union, connection, discipline, practice, austerity
  noun (masculine)
  Root: yuj (class 7)
• vaha – bearing, carrying, bringing, practicing, undergoing
  adjective
  Agent noun/adjective from root vah
  Root: vah (class 1)

ग्रीष्मे (grīṣme) - in summer, during the summer season

(noun)

Locative, masculine, singular of grīṣma

grīṣma - summer, summer season

विधि-दृष्टेन (vidhi-dṛṣṭena) - by what is prescribed by rule, according to prescribed rules

(adjective)

Instrumental, neuter, singular of vidhidṛṣṭa

vidhidṛṣṭa - seen or prescribed by rule, lawful

Compound type : tatpuruṣa (vidhi+dṛṣṭa)

• vidhi – rule, precept, ordinance, method
  noun (masculine)
• dṛṣṭa – seen, observed, prescribed, determined
  adjective
  Past Passive Participle
  Derived from root dṛś
  Root: dṛś (class 1)

Note: Agrees with 'karmaṇā'.

कर्मणा (karmaṇā) - by action, by deed, by ritual

(noun)

Instrumental, neuter, singular of karman

karman - action, deed, work, ritual, religious act (karma)

Root: kṛ (class 8)

चीर्त्वा (cīrtvā) - having performed, having practiced, having observed

(indeclinable)

Absolutive (Gerund)

Derived from root car with suffix -tvā

Root: car (class 1)

द्वादश (dvādaśa) - twelve

(numeral)

Note: Functions as an adjective agreeing with 'varṣāṇi'.

वर्षाणि (varṣāṇi) - years, rainy seasons

(noun)

Accusative, neuter, plural of varṣa

varṣa - year, rain, rainy season

राजा (rājā) - king, ruler

(noun)

Nominative, masculine, singular of rājan

rājan - king, monarch, ruler

भवति (bhavati) - becomes, is, happens

(verb)

3rd person , singular, active, present (laṭ) of bhū

Root: bhū (class 1)

पार्थिवः (pārthivaḥ) - earthly, a king, ruler, prince

(noun)

Nominative, masculine, singular of pārthiva

pārthiva - earthly, terrestrial, relating to the earth; also, a king, prince, ruler

Derived from pṛthivī (earth)