महाभारतः mahābhārataḥ - book-1, chapter-54, verse-21

तस्य तद्वचनं श्रुत्वा कृष्णद्वैपायनस्तदा ।
शशास शिष्यमासीनं वैशंपायनमन्तिके ॥२१॥

21. tasya tadvacanaṁ śrutvā kṛṣṇadvaipāyanastadā ,
śaśāsa śiṣyamāsīnaṁ vaiśaṁpāyanamantike.

21. tasya tat vacanam śrutvā kṛṣṇadvaipāyanaḥ tadā
śaśāsa śiṣyam āsīnam vaiśaṃpāyanam antike

21. Having heard his words, Kṛṣṇa Dvaipāyana then instructed his disciple Vaiśampāyana, who was sitting near him.

Words meanings summery:

• तस्य (tasya) - his (of the speaker in the previous verse) (his, of him, of that)

• तत् (tat) - that (specific) (that, it)

• वचनम् (vacanam) - words, statement (word, speech, saying)

• श्रुत्वा (śrutvā) - having heard

• कृष्णद्वैपायनः (kṛṣṇadvaipāyanaḥ) - Kṛṣṇa Dvaipāyana (Kṛṣṇa Dvaipāyana (Vyāsa))

• तदा (tadā) - then (then, at that time)

• शशास (śaśāsa) - he instructed (he ruled, he taught, he instructed)

• शिष्यम् (śiṣyam) - his disciple (disciple, pupil)

• आसीनम् (āsīnam) - who was seated (seated, sitting)

• वैशंपायनम् (vaiśaṁpāyanam) - Vaiśampāyana (Vaiśampāyana (name))

• अन्तिके (antike) - nearby (near, close by)

Words meanings and morphology

तस्य (tasya) - his (of the speaker in the previous verse) (his, of him, of that)

(pronoun)

Genitive, masculine, singular of tad

tad - that, he, she, it

Demonstrative pronoun.

तत् (tat) - that (specific) (that, it)

(pronoun)

Accusative, neuter, singular of tad

tad - that, he, she, it

Demonstrative pronoun.

वचनम् (vacanam) - words, statement (word, speech, saying)

(noun)

Accusative, neuter, singular of vacana

vacana - speaking, saying, word, speech

action noun

From √vac (to speak) + ana suffix.

Root: vac (class 2)

श्रुत्वा (śrutvā) - having heard

(indeclinable)

indeclinable participle (absolutive/gerund)

From root śru with ktvā suffix.

Root: śru (class 5)

कृष्णद्वैपायनः (kṛṣṇadvaipāyanaḥ) - Kṛṣṇa Dvaipāyana (Kṛṣṇa Dvaipāyana (Vyāsa))

(noun)

Nominative, masculine, singular of kṛṣṇadvaipāyana

kṛṣṇadvaipāyana - Name of Vyāsa, born on an island (dvīpa) and dark-skinned (kṛṣṇa).

Compound name.

Compound type : karmadhāraya (kṛṣṇa+dvaipāyana)

• kṛṣṇa – dark, black, dark-skinned; Krishna
  adjective (masculine)
• dvaipāyana – dweller of an island, island-born
  noun (masculine)
  Derived from dvīpa (island)

तदा (tadā) - then (then, at that time)

(indeclinable)

Adverb of time.

शशास (śaśāsa) - he instructed (he ruled, he taught, he instructed)

(verb)

3rd person , singular, active, past perfect (liṭ) of √śās

perfect tense

Perfect 3rd person singular, active voice.

Root: śās (class 2)

शिष्यम् (śiṣyam) - his disciple (disciple, pupil)

(noun)

Accusative, masculine, singular of śiṣya

śiṣya - pupil, disciple, student

passive sense from √śās (to be taught)

Gerundive or nomen agentis from √śās.

Root: śās (class 2)

Note: Object of śaśāsa.

आसीनम् (āsīnam) - who was seated (seated, sitting)

(participle)

Accusative, masculine, singular of āsīna

āsīna - seated, sitting, dwelling

past active participle (or perfect participle)

From ā-√ās (to sit down).

Prefix: ā

Root: ās (class 2)

Note: Qualifies śiṣyam.

वैशंपायनम् (vaiśaṁpāyanam) - Vaiśampāyana (Vaiśampāyana (name))

(noun)

Accusative, masculine, singular of vaiśaṃpāyana

vaiśaṁpāyana - Name of a sage, disciple of Vyāsa.

Patronymic of Śaṃpāyana, or derived from viśaṃpa.

Note: Object of śaśāsa, in apposition to śiṣyam.

अन्तिके (antike) - nearby (near, close by)

(indeclinable)

From anta (end, proximity).