महाभारतः mahābhārataḥ - book-13, chapter-110, verse-9

त्रीणि वर्षाणि यः प्राशेत्सततं त्वेकभोजनम् ।
धर्मपत्नीरतो नित्यमग्निष्टोमफलं लभेत् ॥९॥

9. trīṇi varṣāṇi yaḥ prāśetsatataṁ tvekabhojanam ,
dharmapatnīrato nityamagniṣṭomaphalaṁ labhet.

9. trīṇi varṣāṇi yaḥ prāśet satatam tu eka-bhojanam
dharma-patnī-rataḥ nityam agniṣṭoma-phalam labhet

9. yaḥ trīṇi varṣāṇi satatam tu eka-bhojanam prāśet
nityam dharma-patnī-rataḥ agniṣṭoma-phalam labhet

9. Whoever eats only one meal a day continuously for three years, and is always devoted to his lawful wife, attains the reward of the Agniṣṭoma (Vedic ritual).

Words meanings summery:

• त्रीणि (trīṇi) - three

• वर्षाणि (varṣāṇi) - years

• यः (yaḥ) - whoever (who, which)

• प्राशेत् (prāśet) - should eat, should consume

• सततम् (satatam) - continuously (constantly, perpetually, continuously)

• तु (tu) - but, on the other hand, indeed, however

• एक-भोजनम् (eka-bhojanam) - one meal (a day) (single meal, one meal)

• धर्म-पत्नी-रतः (dharma-patnī-rataḥ) - devoted to his lawful wife

• नित्यम् (nityam) - always (constantly, perpetually, always)

• अग्निष्टोम-फलम् (agniṣṭoma-phalam) - the reward of the Agniṣṭoma (Vedic ritual) (the fruit/reward of the Agniṣṭoma)

• लभेत् (labhet) - attains (should obtain, should attain, should gain)

Words meanings and morphology

त्रीणि (trīṇi) - three

(numeral (adjective))

वर्षाणि (varṣāṇi) - years

(noun)

Accusative, neuter, plural of varṣa

varṣa - year, rain, monsoon

Root: vṛṣ (class 1)

यः (yaḥ) - whoever (who, which)

(pronoun)

Nominative, masculine, singular of yad

yad - who, which, what (relative pronoun)

प्राशेत् (prāśet) - should eat, should consume

(verb)

3rd person , singular, active, optative (vidhiliṅ) of pra-aś

optative mood, 3rd person singular

Root aś (9th class) with prefix pra-.

Prefix: pra

Root: aś (class 9)

सततम् (satatam) - continuously (constantly, perpetually, continuously)

(indeclinable)

From sa (with) + tata (stretched, extended).

Root: tan (class 8)

Note: Adverbial usage of accusative neuter singular.

तु (tu) - but, on the other hand, indeed, however

(indeclinable)

एक-भोजनम् (eka-bhojanam) - one meal (a day) (single meal, one meal)

(noun)

Accusative, neuter, singular of eka-bhojana

eka-bhojana - a single meal, eating only once

Compound.

Compound type : karmadhāraya (eka+bhojana)

• eka – one, single, unique
  numeral (adjective)
• bhojana – eating, food, meal
  noun (neuter)
  From root bhuj (to eat) + ana suffix.
  Root: bhuj (class 7)

Note: Object of the verb prāśet.

धर्म-पत्नी-रतः (dharma-patnī-rataḥ) - devoted to his lawful wife

(adjective)

Nominative, masculine, singular of dharma-patnī-rata

dharma-patnī-rata - devoted to his lawful wife

Compound.

Compound type : bahuvrīhi (dharma+patnī+rata)

• dharma – righteous conduct, law, duty, intrinsic nature
  noun (masculine)
  Root: dhṛ (class 1)
• patnī – wife, mistress of the house
  noun (feminine)
• rata – attached, devoted, fond of, engaged in
  adjective (past passive participle) (masculine)
  Past Passive Participle
  From root ram (to delight, to be pleased) + kta suffix.
  Root: ram (class 1)

Note: Adjective describing yaḥ.

नित्यम् (nityam) - always (constantly, perpetually, always)

(indeclinable)

Note: Adverbial usage.

अग्निष्टोम-फलम् (agniṣṭoma-phalam) - the reward of the Agniṣṭoma (Vedic ritual) (the fruit/reward of the Agniṣṭoma)

(noun)

Accusative, neuter, singular of agniṣṭoma-phala

agniṣṭoma-phala - the fruit or result of the Agniṣṭoma (a major Vedic ritual)

Compound.

Compound type : tatpuruṣa (agniṣṭoma+phala)

• agniṣṭoma – a major Vedic ritual, a type of soma sacrifice
  noun (masculine)
• phala – fruit, result, consequence, reward
  noun (neuter)

Note: Object of the verb labhet.

लभेत् (labhet) - attains (should obtain, should attain, should gain)

(verb)

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

optative mood, 3rd person singular

Root labh (1st class, Ātmanepada).

Root: labh (class 1)