महाभारतः mahābhārataḥ - book-5, chapter-48, verse-19

नरनारायणौ देवौ पूर्वदेवाविति श्रुतिः ।
अजेयौ मानुषे लोके सेन्द्रैरपि सुरासुरैः ॥१९॥

19. naranārāyaṇau devau pūrvadevāviti śrutiḥ ,
ajeyau mānuṣe loke sendrairapi surāsuraiḥ.

19. naranārāyaṇau devau pūrvadevau iti śrutiḥ
ajeyau mānuṣe loke saindraiḥ api surāsuraiḥ

19. Nara and Narayana are indeed the two primeval gods, so says the sacred tradition (śruti). They are unconquerable in the human world, even by the gods and asuras combined with Indra.

Words meanings summery:

• नरनारायणौ (naranārāyaṇau) - Nara and Narayana

• देवौ (devau) - two gods

• पूर्वदेवौ (pūrvadevau) - primeval gods, ancient gods

• इति (iti) - thus, so, marking a quotation

• श्रुतिः (śrutiḥ) - sacred tradition, Vedic text, revelation

• अजेयौ (ajeyau) - unconquerable (two)

• मानुषे (mānuṣe) - in the human

• लोके (loke) - in the world

• सैन्द्रैः (saindraiḥ) - along with Indra

• अपि (api) - even, also

• सुरासुरैः (surāsuraiḥ) - by gods and asuras

Words meanings and morphology

नरनारायणौ (naranārāyaṇau) - Nara and Narayana

(proper noun)

Nominative, masculine, dual of naranārāyaṇa

naranārāyaṇa - Nara and Narayana (divine sages, often identified with Arjuna and Krishna)

Compound type : dvandva (nara+nārāyaṇa)

• nara – man, human, primeval man
  noun (masculine)
• nārāyaṇa – Narayana (a name of Vishnu/Krishna, often identified as the divine companion of Nara)
  proper noun (masculine)

Note: Refers to the pair Nara and Narayana.

देवौ (devau) - two gods

(noun)

Nominative, masculine, dual of deva

deva - god, deity

Root: div (class 4)

पूर्वदेवौ (pūrvadevau) - primeval gods, ancient gods

(noun)

Nominative, masculine, dual of pūrvadeva

pūrvadeva - ancient god, primeval deity

Compound type : karmadhāraya (pūrva+deva)

• pūrva – former, ancient, primeval
  adjective
• deva – god, deity
  noun (masculine)
  Root: div (class 4)

इति (iti) - thus, so, marking a quotation

(indeclinable)

श्रुतिः (śrutiḥ) - sacred tradition, Vedic text, revelation

(noun)

Nominative, feminine, singular of śruti

śruti - sacred tradition (śruti), Vedic text, revelation, hearing

Root: śru (class 5)

अजेयौ (ajeyau) - unconquerable (two)

(adjective)

Nominative, masculine, dual of ajeya

ajeya - unconquerable, invincible

Gerundive (NVA)

From root ji (to conquer) with negative prefix a- and suffix -eya, meaning 'not to be conquered'.

Prefix: a

Root: ji (class 1)

Note: Qualifies Nara and Narayana.

मानुषे (mānuṣe) - in the human

(adjective)

Locative, masculine/neuter, singular of mānuṣa

mānuṣa - human, pertaining to humans

Note: Qualifies loke.

लोके (loke) - in the world

(noun)

Locative, masculine, singular of loka

loka - world, realm, people

सैन्द्रैः (saindraiḥ) - along with Indra

(adjective)

Instrumental, masculine, plural of saindra

saindra - with Indra, accompanied by Indra

sa (with) + indra (Indra). Formed like a bahuvrihi, indicating those who are with Indra.

Compound type : bahuvrīhi (sa+indra)

• sa – with, accompanied by
  indeclinable
  used as a prefix to form compounds
• indra – Indra (king of the gods)
  proper noun (masculine)

Note: Qualifies surāsuraiḥ.

अपि (api) - even, also

(indeclinable)

सुरासुरैः (surāsuraiḥ) - by gods and asuras

(noun)

Instrumental, masculine, plural of surāsura

surāsura - gods and asuras

Compound type : dvandva (sura+asura)

• sura – god, deity
  noun (masculine)
• asura – demon, titan, non-god
  noun (masculine)