महाभारतः mahābhārataḥ - book-13, chapter-99, verse-15

निदाघकाले पानीयं तडागे यस्य तिष्ठति ।
वाजपेयसमं तस्य फलं वै मुनयो विदुः ॥१५॥

15. nidāghakāle pānīyaṁ taḍāge yasya tiṣṭhati ,
vājapeyasamaṁ tasya phalaṁ vai munayo viduḥ.

15. nidāghakāle pānīyam taḍāge yasya tiṣṭhati
vājapeyasamam tasya phalam vai munayaḥ viduḥ

15. munayaḥ vai viduḥ yasya taḍāge nidāghakāle
pānīyam tiṣṭhati tasya phalam vājapeyasamam

15. The sages (muni) indeed know that the reward for one in whose pond water remains during the summer season is equivalent to that of a Vājapeya (Vedic ritual).

Words meanings summery:

• निदाघकाले (nidāghakāle) - in the summer season, during the hot season

• पानीयम् (pānīyam) - water, drinkable (thing)

• तडागे (taḍāge) - in the pond, in the reservoir

• यस्य (yasya) - whose, of which, for whom

• तिष्ठति (tiṣṭhati) - stands, remains, stays, exists

• वाजपेयसमम् (vājapeyasamam) - equal to a Vājapeya (Vedic ritual)

• तस्य (tasya) - his, of him, for him

• फलम् (phalam) - fruit, result, reward

• वै (vai) - indeed, surely, certainly

• मुनयः (munayaḥ) - sages, ascetics

• विदुः (viduḥ) - know, understand

Words meanings and morphology

निदाघकाले (nidāghakāle) - in the summer season, during the hot season

(noun)

Locative, masculine, singular of nidāghakāla

nidāghakāla - summer season, hot season

Compound type : tatpurusha (nidāgha+kāla)

• nidāgha – heat, summer, intense heat
  noun (masculine)
  Prefix: ni
  Root: dah (class 1)
• kāla – time, season
  noun (masculine)

पानीयम् (pānīyam) - water, drinkable (thing)

(noun)

Nominative, neuter, singular of pānīya

pānīya - drinkable; water (as a noun)

Gerundive

Root pā 'to drink' + anīya suffix.

Root: pā (class 1)

तडागे (taḍāge) - in the pond, in the reservoir

(noun)

Locative, masculine, singular of taḍāga

taḍāga - pond, pool, tank, reservoir

यस्य (yasya) - whose, of which, for whom

(pronoun)

Genitive, masculine, singular of yat

yat - who, which, what, whatever

Note: Refers to the person who owns the pond.

तिष्ठति (tiṣṭhati) - stands, remains, stays, exists

(verb)

3rd person , singular, active, present (laṭ) of sthā

Root: sthā (class 1)

वाजपेयसमम् (vājapeyasamam) - equal to a Vājapeya (Vedic ritual)

(adjective)

Nominative, neuter, singular of vājapeyasamam

vājapeyasamam - equal to a Vājapeya

Compound type : tatpurusha (vājapeya+sama)

• vājapeya – a particular Vedic ritual (yajña) in which soma is drunk and chariots are raced
  noun (masculine)
• sama – equal, similar, like
  adjective

Note: Qualifies 'phalam' (result).

तस्य (tasya) - his, of him, for him

(pronoun)

Genitive, masculine, singular of tad

tad - that, he, she, it

Note: Refers to the person who owns the pond.

फलम् (phalam) - fruit, result, reward

(noun)

Nominative, neuter, singular of phala

phala - fruit, result, consequence, reward

Note: The main subject of the second clause.

वै (vai) - indeed, surely, certainly

(indeclinable)

Note: An emphatic particle.

मुनयः (munayaḥ) - sages, ascetics

(noun)

Nominative, masculine, plural of muni

muni - sage, ascetic, silent one, seer

Note: Subject of 'viduḥ'.

विदुः (viduḥ) - know, understand

(verb)

3rd person , plural, active, present (laṭ) of vid

Root: vid (class 2)