महाभारतः mahābhārataḥ - book-12, chapter-79, verse-9

अत्र ते वर्तयिष्यामि यथा धर्मः पुरातनः ।
व्यवहारप्रवृत्तानां तन्निबोध युधिष्ठिर ॥९॥

9. atra te vartayiṣyāmi yathā dharmaḥ purātanaḥ ,
vyavahārapravṛttānāṁ tannibodha yudhiṣṭhira.

9. atra te vartayiṣyāmi yathā dharmaḥ purātanaḥ
vyavahāra-pravṛttānām tat nibodha yudhiṣṭhira

9. atra te yathā purātanaḥ dharmaḥ vyavahāra-pravṛttānām vartayiṣyāmi,
yudhiṣṭhira tat nibodha

9. Here I will explain to you how the ancient natural law (dharma) operates for those engaged in worldly affairs. Listen to that, Yudhishthira.

Words meanings summery:

• अत्र (atra) - in this matter (of dharma) (here, in this place, in this matter)

• ते (te) - to you, for you

• वर्तयिष्यामि (vartayiṣyāmi) - I will explain (how it operates) (I will explain, I will cause to proceed/act)

• यथा (yathā) - as, how, in which way

• धर्मः (dharmaḥ) - natural law (natural law, righteousness, duty, constitution)

• पुरातनः (purātanaḥ) - ancient, old, primeval

• व्यवहार-प्रवृत्तानाम् (vyavahāra-pravṛttānām) - of those engaged in worldly affairs (of those engaged in affairs/dealings)

• तत् (tat) - that

• निबोध (nibodha) - listen to (understand) (understand, learn, listen to)

• युधिष्ठिर (yudhiṣṭhira) - O Yudhishthira

Words meanings and morphology

अत्र (atra) - in this matter (of dharma) (here, in this place, in this matter)

(indeclinable)

ते (te) - to you, for you

(pronoun)

Dative, singular of yuṣmad

yuṣmad - you

Note: Can also be genitive, but dative fits here.

वर्तयिष्यामि (vartayiṣyāmi) - I will explain (how it operates) (I will explain, I will cause to proceed/act)

(verb)

1st person , singular, active, future (lṛṭ) of vṛt

Causative Future

Root vṛt with causative suffix -aya. Future tense, 1st person singular, active voice.

Root: vṛt (class 1)

यथा (yathā) - as, how, in which way

(indeclinable)

धर्मः (dharmaḥ) - natural law (natural law, righteousness, duty, constitution)

(noun)

Nominative, masculine, singular of dharma

dharma - constitution, natural law, intrinsic nature

Root: dhṛ (class 1)

पुरातनः (purātanaḥ) - ancient, old, primeval

(adjective)

Nominative, masculine, singular of purātana

purātana - ancient, old, primeval

व्यवहार-प्रवृत्तानाम् (vyavahāra-pravṛttānām) - of those engaged in worldly affairs (of those engaged in affairs/dealings)

(adjective)

Genitive, masculine, plural of vyavahāra-pravṛtta

vyavahāra-pravṛtta - engaged in worldly affairs/dealings

Compound type : tatpuruṣa (vyavahāra+pravṛtta)

• vyavahāra – conduct, transaction, worldly affair, practice
  noun (masculine)
  From root hṛ with prefixes vi-ava.
  Prefixes: vi+ava
  Root: hṛ (class 1)
• pravṛtta – engaged in, proceeded, commenced, set in motion
  adjective (masculine)
  Past Passive Participle
  From root vṛt with prefix pra-.
  Prefix: pra
  Root: vṛt (class 1)

तत् (tat) - that

(pronoun)

Accusative, neuter, singular of tad

tad - that (demonstrative pronoun)

निबोध (nibodha) - listen to (understand) (understand, learn, listen to)

(verb)

2nd person , singular, active, imperative (loṭ) of ni-budh

Imperative

Root budh with prefix ni-.

Prefix: ni

Root: budh (class 1)

युधिष्ठिर (yudhiṣṭhira) - O Yudhishthira

(proper noun)

Vocative, masculine, singular of yudhiṣṭhira

yudhiṣṭhira - Yudhishthira (name of the eldest Pandava brother)