महाभारतः mahābhārataḥ - book-3, chapter-83, verse-37

ततोऽवाप्य महापुण्यां पयोष्णीं सरितां वराम् ।
पितृदेवार्चनरतो गोसहस्रफलं लभेत् ॥३७॥

37. tato'vāpya mahāpuṇyāṁ payoṣṇīṁ saritāṁ varām ,
pitṛdevārcanarato gosahasraphalaṁ labhet.

37. tataḥ avāpya mahāpuṇyām payoṣṇīm saritām varām
pitṛdevārcanarataḥ gosahasraphalam labhet

37. Then, having reached the Payoṣṇī, an extremely sacred river and the best among rivers, a person devoted to the worship of ancestors and gods would obtain the merit of (giving) a thousand cows.

Words meanings summery:

• ततः (tataḥ) - then (indicating sequence) (then, thence, from there)

• अवाप्य (avāpya) - having reached (the river) (having obtained, having reached, having attained)

• महापुण्याम् (mahāpuṇyām) - greatly sacred, very meritorious

• पयोष्णीम् (payoṣṇīm) - Payoṣṇī (name of a river)

• सरिताम् (saritām) - of rivers

• वराम् (varām) - best, excellent, choicest

• पितृदेवार्चनरतः (pitṛdevārcanarataḥ) - devoted to the worship of ancestors and gods

• गोसहस्रफलम् (gosahasraphalam) - the merit equivalent to giving a thousand cows (the merit of a thousand cows (or giving a thousand cows))

• लभेत् (labhet) - one would obtain, one would gain

Words meanings and morphology

ततः (tataḥ) - then (indicating sequence) (then, thence, from there)

(indeclinable)

अवाप्य (avāpya) - having reached (the river) (having obtained, having reached, having attained)

(indeclinable)

absolutive (gerund)

from prefix ava- and root √āp (to obtain, reach)

Prefix: ava

Root: āp (class 5)

महापुण्याम् (mahāpuṇyām) - greatly sacred, very meritorious

(adjective)

Accusative, feminine, singular of mahāpuṇyā

mahāpuṇyā - greatly sacred, very holy, highly meritorious

Compound type : karmadhāraya (mahā+puṇyā)

• mahā – great, large, mighty
  adjective (feminine)
• puṇyā – sacred, holy, virtuous, meritorious
  adjective (feminine)

Note: Agrees with Payoṣṇīm

पयोष्णीम् (payoṣṇīm) - Payoṣṇī (name of a river)

(proper noun)

Accusative, feminine, singular of payoṣṇī

payoṣṇī - Name of a sacred river

सरिताम् (saritām) - of rivers

(noun)

Genitive, feminine, plural of sarit

sarit - river, stream

Root: sṛ

वराम् (varām) - best, excellent, choicest

(adjective)

Accusative, feminine, singular of varā

varā - best, excellent, choicest, boon

Feminine form of vara

Root: vṛ

पितृदेवार्चनरतः (pitṛdevārcanarataḥ) - devoted to the worship of ancestors and gods

(adjective)

Nominative, masculine, singular of pitṛdevārcanarata

pitṛdevārcanarata - engaged in/devoted to the worship of ancestors and gods

Compound type : tatpurusha (pitṛ+deva+arcana+rata)

• pitṛ – father, ancestor
  noun (masculine)
• deva – god, deity
  noun (masculine)
• arcana – worship, adoration, offering
  noun (neuter)
  action noun
  From root √arc (to worship)
  Root: arc (class 1)
• rata – devoted, engaged, delighted in
  adjective (masculine)
  past passive participle
  From root √ram (to delight, sport)
  Root: ram (class 1)

Note: Refers to the implied subject of 'labhet'

गोसहस्रफलम् (gosahasraphalam) - the merit equivalent to giving a thousand cows (the merit of a thousand cows (or giving a thousand cows))

(noun)

Accusative, neuter, singular of gosahasraphala

gosahasraphala - the fruit/merit of a thousand cows

Compound type : tatpurusha (go+sahasra+phala)

• go – cow, ox, cattle, ray of light
  noun (masculine/feminine)
• sahasra – thousand
  noun (neuter)
• phala – fruit, result, reward, merit
  noun (neuter)

लभेत् (labhet) - one would obtain, one would gain

(verb)

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

optative mood, 3rd person singular

from root √labh (to obtain)

Root: labh (class 1)