महाभारतः mahābhārataḥ - book-13, chapter-26, verse-53

कुल्यायां समुपस्पृश्य जप्त्वा चैवाघमर्षणम् ।
अश्वमेधमवाप्नोति त्रिरात्रोपोषितः शुचिः ॥५३॥

53. kulyāyāṁ samupaspṛśya japtvā caivāghamarṣaṇam ,
aśvamedhamavāpnoti trirātropoṣitaḥ śuciḥ.

53. kulyāyām samupaspṛśya japtvā ca eva aghamarṣaṇam
aśvamedham avāpnoti trirātropoṣitaḥ śuciḥ

53. A pure person, having fasted for three nights, who performs thorough ritual ablutions in a small canal and indeed recites the Aghamarṣaṇa hymn, attains the merit of an aśvamedha (Vedic ritual).

Words meanings summery:

• कुल्यायाम् (kulyāyām) - in the small canal, in the stream

• समुपस्पृश्य (samupaspṛśya) - having performed thorough ritual ablutions

• जप्त्वा (japtvā) - having recited, having muttered (mantras)

• च (ca) - and, also

• एव (eva) - indeed, just, only

• अघमर्षणम् (aghamarṣaṇam) - the specific Vedic hymn known as Aghamarṣaṇa (the Aghamarṣaṇa hymn (for expiating sins))

• अश्वमेधम् (aśvamedham) - the aśvamedha (Vedic ritual), the horse sacrifice

• अवाप्नोति (avāpnoti) - attains, obtains, reaches

• त्रिरात्रोपोषितः (trirātropoṣitaḥ) - one who has fasted for three nights

• शुचिः (śuciḥ) - pure, clean, holy

Words meanings and morphology

कुल्यायाम् (kulyāyām) - in the small canal, in the stream

(noun)

Locative, feminine, singular of kulyā

kulyā - small canal, ditch, stream

समुपस्पृश्य (samupaspṛśya) - having performed thorough ritual ablutions

(indeclinable)

gerund/absolutive

Formed from root `spṛś` with prefixes `sam-` and `upa-`.

Prefixes: sam+upa

Root: spṛś (class 6)

जप्त्वा (japtvā) - having recited, having muttered (mantras)

(indeclinable)

gerund/absolutive

Formed from root `jap`.

Root: jap (class 1)

च (ca) - and, also

(indeclinable)

एव (eva) - indeed, just, only

(indeclinable)

अघमर्षणम् (aghamarṣaṇam) - the specific Vedic hymn known as Aghamarṣaṇa (the Aghamarṣaṇa hymn (for expiating sins))

(noun)

Accusative, neuter, singular of aghamarṣaṇa

aghamarṣaṇa - expiation of sin, the Aghamarṣaṇa hymn

Compound type : tatpuruṣa (agha+marṣaṇa)

• agha – sin, evil, distress
  noun (neuter)
• marṣaṇa – pardoning, expiating, enduring
  noun (neuter)
  verbal noun
  Derived from root `mṛṣ` (to bear, forgive).
  Root: mṛṣ (class 1)

अश्वमेधम् (aśvamedham) - the aśvamedha (Vedic ritual), the horse sacrifice

(noun)

Accusative, masculine, singular of aśvamedha

aśvamedha - aśvamedha (a major Vedic ritual involving a horse)

Compound type : tatpuruṣa (aśva+medha)

• aśva – horse
  noun (masculine)
• medha – Vedic ritual, sacrifice, oblation
  noun (masculine)

अवाप्नोति (avāpnoti) - attains, obtains, reaches

(verb)

3rd person , singular, active, present indicative (laṭ) of āp

Prefix: ava

Root: āp (class 5)

त्रिरात्रोपोषितः (trirātropoṣitaḥ) - one who has fasted for three nights

(adjective)

Nominative, masculine, singular of trirātropoṣita

trirātropoṣita - having fasted for three nights

Compound of 'three nights' (`trirātra`) and 'one who has fasted' (`upoṣita`).

Compound type : bahuvrīhi (trirātra+upoṣita)

• trirātra – three nights
  noun (neuter)
• upoṣita – fasted, stayed near
  adjective (masculine)
  Past Passive Participle
  Derived from root `vas` (to dwell, fast) with prefix `upa-`.
  Prefix: upa
  Root: vas (class 1)

शुचिः (śuciḥ) - pure, clean, holy

(adjective)

Nominative, masculine, singular of śuci

śuci - pure, clean, holy