महाभारतः mahābhārataḥ - book-3, chapter-45, verse-18

नरनारायणौ यौ तौ पुराणावृषिसत्तमौ ।
ताविमावभिजानीहि हृषीकेशधनंजयौ ॥१८॥

18. naranārāyaṇau yau tau purāṇāvṛṣisattamau ,
tāvimāvabhijānīhi hṛṣīkeśadhanaṁjayau.

18. naranārāyaṇau yau tau purāṇau ṛṣisattamau
tau imau abhijānīhi hṛṣīkeśadhananjayau

18. Recognize these two, Hṛṣīkeśa and Dhanañjaya, as those ancient, best among sages, Nara and Nārāyaṇa.

Words meanings summery:

• नरनारायणौ (naranārāyaṇau) - Nara and Nārāyaṇa

• यौ (yau) - who, which two

• तौ (tau) - those two

• पुराणौ (purāṇau) - ancient, old

• ऋषिसत्तमौ (ṛṣisattamau) - best among sages

• तौ (tau) - those two

• इमौ (imau) - these two

• अभिजानीहि (abhijānīhi) - know, recognize, understand

• हृषीकेशधनन्जयौ (hṛṣīkeśadhananjayau) - Hṛṣīkeśa and Dhanañjaya (Krishna and Arjuna)

Words meanings and morphology

नरनारायणौ (naranārāyaṇau) - Nara and Nārāyaṇa

(proper noun)

Nominative, masculine, dual of naranārāyaṇa

naranārāyaṇa - Nara and Nārāyaṇa (mythological twin sages, identified with Arjuna and Krishna)

Compound type : dvandva (nara+nārāyaṇa)

• nara – man, human, primeval man
  noun (masculine)
• nārāyaṇa – Nārāyaṇa (a name of Viṣṇu)
  proper noun (masculine)

यौ (yau) - who, which two

(pronoun)

Nominative, masculine, dual of yad

yad - who, which, what

तौ (tau) - those two

(pronoun)

Nominative, masculine, dual of tad

tad - that, those

पुराणौ (purāṇau) - ancient, old

(adjective)

Nominative, masculine, dual of purāṇa

purāṇa - ancient, old, former; a Purāṇa (sacred text)

ऋषिसत्तमौ (ṛṣisattamau) - best among sages

(noun)

Nominative, masculine, dual of ṛṣisattama

ṛṣisattama - best of sages, most excellent sage

Compound type : tatpuruṣa (ṛṣi+sattama)

• ṛṣi – sage, seer, inspired poet
  noun (masculine)
• sattama – best, most excellent
  adjective (masculine)
  Superlative suffix -tama

तौ (tau) - those two

(pronoun)

Nominative, masculine, dual of tad

tad - that, those

इमौ (imau) - these two

(pronoun)

Nominative, masculine, dual of idam

idam - this, these

अभिजानीहि (abhijānīhi) - know, recognize, understand

(verb)

2nd person , singular, active, imperative (loṭ) of jñā

Imperative, active voice

2nd person, singular, imperative form of root jñā with prefix abhi

Prefix: abhi

Root: jñā (class 9)

हृषीकेशधनन्जयौ (hṛṣīkeśadhananjayau) - Hṛṣīkeśa and Dhanañjaya (Krishna and Arjuna)

(proper noun)

Nominative, masculine, dual of hṛṣīkeśadhananjaya

hṛṣīkeśadhananjaya - Hṛṣīkeśa and Dhanañjaya (Krishna and Arjuna)

Compound type : dvandva (hṛṣīkeśa+dhanañjaya)

• hṛṣīkeśa – Hṛṣīkeśa (an epithet of Krishna, master of the senses)
  proper noun (masculine)
• dhanañjaya – Dhanañjaya (an epithet of Arjuna, conqueror of wealth)
  proper noun (masculine)