महाभारतः mahābhārataḥ - book-14, chapter-46, verse-12

प्रवृत्तमुदकं वायुं सर्वं वानेयमा तृणात् ।
प्राश्नीयादानुपूर्व्येण यथादीक्षमतन्द्रितः ॥१२॥

12. pravṛttamudakaṁ vāyuṁ sarvaṁ vāneyamā tṛṇāt ,
prāśnīyādānupūrvyeṇa yathādīkṣamatandritaḥ.

12. pravṛttam udakam vāyum sarvam vāneyam ā tṛṇāt
prāśnīyāt ānupūrvyeṇa yathādīkṣam atandritaḥ

12. atandritaḥ yathādīkṣam ānupūrvyeṇa pravṛttam
udakam vāyum sarvam vāneyam ā tṛṇāt prāśnīyāt

12. One should diligently consume flowing water, air, and all things grown in the forest, even down to grass, in the prescribed order and according to one's spiritual vow (dīkṣā).

Words meanings summery:

• प्रवृत्तम् (pravṛttam) - flowing, arisen, engaged in

• उदकम् (udakam) - water

• वायुम् (vāyum) - air, wind

• सर्वम् (sarvam) - all, whole, every

• वानेयम् (vāneyam) - forest-grown, wild, belonging to the forest

• आ (ā) - up to, till, including, from

• तृणात् (tṛṇāt) - from grass, beginning from grass

• प्राश्नीयात् (prāśnīyāt) - one should eat, consume

• आनुपूर्व्येण (ānupūrvyeṇa) - in due order, successively

• यथादीक्षम् (yathādīkṣam) - according to the initiation/vow

• अतन्द्रितः (atandritaḥ) - diligent, not lazy, watchful

Words meanings and morphology

प्रवृत्तम् (pravṛttam) - flowing, arisen, engaged in

(participle)

Accusative, neuter, singular of pravṛtta

pravṛtta - flowing, set in motion, engaged in, arisen

Past Passive Participle

Derived from √vṛt (P. 1) 'to be, exist, turn' with prefix pra- and -kta suffix

Prefix: pra

Root: vṛt (class 1)

उदकम् (udakam) - water

(noun)

Accusative, neuter, singular of udaka

udaka - water

वायुम् (vāyum) - air, wind

(noun)

Accusative, masculine, singular of vāyu

vāyu - air, wind

सर्वम् (sarvam) - all, whole, every

(pronoun)

Accusative, neuter, singular of sarva

sarva - all, every, whole

वानेयम् (vāneyam) - forest-grown, wild, belonging to the forest

(adjective)

Accusative, neuter, singular of vāneya

vāneya - forest-grown, wild, produced in the forest

Derived from vana (forest) + -eya suffix

आ (ā) - up to, till, including, from

(indeclinable)

तृणात् (tṛṇāt) - from grass, beginning from grass

(noun)

Ablative, neuter, singular of tṛṇa

tṛṇa - grass, straw, herb

प्राश्नीयात् (prāśnīyāt) - one should eat, consume

(verb)

3rd person , singular, active, optative (Liṅ) of pra-aś

Optative Mood

Root √aś (P. 9) 'to eat' with prefix pra-, Parasmaipada

Prefix: pra

Root: aś (class 9)

आनुपूर्व्येण (ānupūrvyeṇa) - in due order, successively

(noun)

Instrumental, neuter, singular of ānupūrvya

ānupūrvya - due order, regular succession

यथादीक्षम् (yathādīkṣam) - according to the initiation/vow

(indeclinable)

Compound type : avyayībhāva (yathā+dīkṣā)

• yathā – as, according to, in which way
  indeclinable
• dīkṣā – initiation, consecration, solemn vow
  noun (feminine)

अतन्द्रितः (atandritaḥ) - diligent, not lazy, watchful

(adjective)

Nominative, masculine, singular of atandrita

atandrita - diligent, alert, active, not lazy

Negative prefix a- with tandrita (lazy/weary)

Compound type : nañ-tatpuruṣa (a+tandrita)

• a – not, un-
  indeclinable
• tandrita – lazy, weary, fatigued
  participle (masculine)
  Past Passive Participle (implied)
  from √tandr (to be weary)
  Root: tandr