महाभारतः mahābhārataḥ - book-9, chapter-34, verse-17

प्रतिस्रोतः सरस्वत्या गच्छध्वं शीघ्रगामिनः ।
ऋत्विजश्चानयध्वं वै शतशश्च द्विजर्षभान् ॥१७॥

17. pratisrotaḥ sarasvatyā gacchadhvaṁ śīghragāminaḥ ,
ṛtvijaścānayadhvaṁ vai śataśaśca dvijarṣabhān.

17. pratisrotaḥ sarasvatyā gacchadhvaṃ śīghragāminaḥ
ṛtvijaḥ ca ānayadhvaṃ vai śataśaḥ ca dvijarṣabhān

17. śīghragāminaḥ sarasvatyā pratisrotaḥ gacchadhvaṃ
ca vai śataśaḥ ṛtvijaḥ ca dvijarṣabhān ānayadhvaṃ

17. O swift-moving ones, go upstream along the Sarasvati (sarasvatī) river. And indeed, bring hundreds of priests and foremost Brahmins (dvija).

Words meanings summery:

• प्रतिस्रोतः (pratisrotaḥ) - upstream (along the Sarasvati river) (against the stream, upstream)

• सरस्वत्या (sarasvatyā) - of the Sarasvati (river) (of the Sarasvati, by the Sarasvati)

• गच्छध्वं (gacchadhvaṁ) - go (go ye, proceed ye)

• शीघ्रगामिनः (śīghragāminaḥ) - O swift-moving ones (referring to the messengers) (O swift-moving ones, swift-movers)

• ऋत्विजः (ṛtvijaḥ) - priests (for the ceremony) (priests)

• च (ca) - and (and, also)

• आनयध्वं (ānayadhvaṁ) - bring (bring ye, cause to come)

• वै (vai) - indeed (emphatic) (indeed, verily, certainly)

• शतशः (śataśaḥ) - by hundreds (by hundreds, in hundreds)

• च (ca) - and (and, also)

• द्विजर्षभान् (dvijarṣabhān) - foremost Brahmins (dvija) (excellent Brahmins, foremost among the twice-born)

Words meanings and morphology

प्रतिस्रोतः (pratisrotaḥ) - upstream (along the Sarasvati river) (against the stream, upstream)

(indeclinable)

Compound type : avyayibhāva (prati+srotas)

• prati – against, towards, for, in return
  indeclinable
• srotas – stream, current, flow
  noun (neuter)
  Root: sru (class 1)

सरस्वत्या (sarasvatyā) - of the Sarasvati (river) (of the Sarasvati, by the Sarasvati)

(proper noun)

Genitive, feminine, singular of sarasvatī

sarasvatī - Sarasvati (a goddess, a sacred river), eloquence, speech

Note: Can also be instrumental 'by the Sarasvati', but genitive 'of the Sarasvati' fits the directional context better.

गच्छध्वं (gacchadhvaṁ) - go (go ye, proceed ye)

(verb)

2nd person , plural, middle, imperative (lot) of gam

Root: gam (class 1)

Note: Ātmanepada form.

शीघ्रगामिनः (śīghragāminaḥ) - O swift-moving ones (referring to the messengers) (O swift-moving ones, swift-movers)

(adjective)

Vocative, masculine, plural of śīghragāmin

śīghragāmin - swift-moving, quickly going

Compound derived from 'śīghra' (swift) and 'gāmin' (going).

Compound type : karmadhāraya (śīghra+gāmin)

• śīghra – swift, quick, rapid
  adjective
• gāmin – going, moving, leading to
  adjective
  agent noun/adjective
  Derived from root gam (to go) with suffix -in.
  Root: gam (class 1)

ऋत्विजः (ṛtvijaḥ) - priests (for the ceremony) (priests)

(noun)

Accusative, masculine, plural of ṛtvij

ṛtvij - priest, sacrificial priest

च (ca) - and (and, also)

(indeclinable)

आनयध्वं (ānayadhvaṁ) - bring (bring ye, cause to come)

(verb)

2nd person , plural, middle, imperative (lot) of nī

Prefix: ā

Root: nī (class 1)

Note: Ātmanepada form.

वै (vai) - indeed (emphatic) (indeed, verily, certainly)

(indeclinable)

An emphatic particle.

शतशः (śataśaḥ) - by hundreds (by hundreds, in hundreds)

(indeclinable)

Adverbial suffix -śas indicates distribution. Derived from śata (hundred).

च (ca) - and (and, also)

(indeclinable)

द्विजर्षभान् (dvijarṣabhān) - foremost Brahmins (dvija) (excellent Brahmins, foremost among the twice-born)

(noun)

Accusative, masculine, plural of dvijarṣabha

dvijarṣabha - excellent Brahmin, foremost of the twice-born

Compound type : tatpuruṣa (dvija+ṛṣabha)

• dvija – twice-born (Brahmin, Kṣatriya, Vaiśya), bird, tooth
  noun (masculine)
• ṛṣabha – bull, best, excellent, chief
  noun (masculine)