महाभारतः mahābhārataḥ - book-1, chapter-158, verse-46

देवगन्धर्ववाहास्ते दिव्यगन्धा मनोगमाः ।
क्षीणाः क्षीणा भवन्त्येते न हीयन्ते च रंहसः ॥४६॥

46. devagandharvavāhāste divyagandhā manogamāḥ ,
kṣīṇāḥ kṣīṇā bhavantyete na hīyante ca raṁhasaḥ.

46. devagandharvavāhāḥ te divyagandhāḥ manogamāḥ
kṣīṇāḥ kṣīṇāḥ bhavanti ete na hīyante ca raṃhasaḥ

46. Those horses, the vehicles of gods and Gandharvas, possess divine fragrance and move as swiftly as thought. Even when they become exhausted, these horses do not diminish their speed.

Words meanings summery:

• देवगन्धर्ववाहाः (devagandharvavāhāḥ) - vehicles of gods and Gandharvas

• ते (te) - those

• दिव्यगन्धाः (divyagandhāḥ) - having divine fragrance

• मनोगमाः (manogamāḥ) - moving as swift as thought

• क्षीणाः (kṣīṇāḥ) - exhausted, diminished

• क्षीणाः (kṣīṇāḥ) - (even when) exhausted

• भवन्ति (bhavanti) - they become

• एते (ete) - these

• न (na) - not

• हीयन्ते (hīyante) - they are diminished, they lose

• च (ca) - and

• रंहसः (raṁhasaḥ) - from speed, of speed

Words meanings and morphology

देवगन्धर्ववाहाः (devagandharvavāhāḥ) - vehicles of gods and Gandharvas

(noun)

Nominative, masculine, plural of devagandharvavāha

devagandharvavāha - vehicle for gods and Gandharvas

Compound type : dvandva then tatpuruṣa (deva+gandharva+vāha)

• deva – god, deity
  noun (masculine)
• gandharva – celestial musician, Gandharva
  noun (masculine)
• vāha – vehicle, carrier
  noun (masculine)
  Root: vah (class 1)

ते (te) - those

(pronoun)

Nominative, masculine, plural of tad

tad - that, those

दिव्यगन्धाः (divyagandhāḥ) - having divine fragrance

(adjective)

Nominative, masculine, plural of divyagandha

divyagandha - having divine fragrance, divinely scented

Compound type : bahuvrīhi (divya+gandha)

• divya – divine, celestial
  adjective
• gandha – smell, fragrance
  noun (masculine)

मनोगमाः (manogamāḥ) - moving as swift as thought

(adjective)

Nominative, masculine, plural of manogama

manogama - swift as thought, moving at will

Compound type : tatpuruṣa (manas+gama)

• manas – mind, thought
  noun (neuter)
• gama – going, moving
  adjective
  derived from gam root
  Root: gam (class 1)

क्षीणाः (kṣīṇāḥ) - exhausted, diminished

(adjective)

Nominative, masculine, plural of kṣīṇa

kṣīṇa - diminished, wasted, exhausted

Past Passive Participle

Root: kṣi (class 7)

क्षीणाः (kṣīṇāḥ) - (even when) exhausted

(adjective)

Nominative, masculine, plural of kṣīṇa

kṣīṇa - diminished, wasted, exhausted

Past Passive Participle

Root: kṣi (class 7)

भवन्ति (bhavanti) - they become

(verb)

3rd person , plural, active, present indicative (laṭ) of bhū

Root: bhū (class 1)

एते (ete) - these

(pronoun)

Nominative, masculine, plural of etad

etad - this, these

न (na) - not

(indeclinable)

हीयन्ते (hīyante) - they are diminished, they lose

(verb)

3rd person , plural, middle, present indicative (laṭ) of hā

Passive form of hā (root Hā II)

Root: hā (class 3)

च (ca) - and

(indeclinable)

रंहसः (raṁhasaḥ) - from speed, of speed

(noun)

Ablative, neuter, singular of raṃhas

raṁhas - speed, velocity, force, momentum

Note: Can be ablative or genitive; here ablative ('from speed') fits best with 'do not diminish'.