महाभारतः mahābhārataḥ - book-12, chapter-175, verse-26

उपरिष्टोपरिष्टात्तु प्रज्वलद्भिः स्वयंप्रभैः ।
निरुद्धमेतदाकाशमप्रमेयं सुरैरपि ॥२६॥

26. upariṣṭopariṣṭāttu prajvaladbhiḥ svayaṁprabhaiḥ ,
niruddhametadākāśamaprameyaṁ surairapi.

26. upariṣṭāt upariṣṭāt tu prajvaladbhiḥ svayaṃprabhaiḥ
niruddham etat ākāśam aprameyam suraiḥ api

26. तु एतत् अप्रमेयम् सुरैः अपि आकाशम् उपरिष्टात्
उपरिष्टात् प्रज्वलद्भिः स्वयंप्रभैः निरुद्धम्

26. Indeed, this immeasurable space (ākāśa), which is not fathomable even by the gods, is obstructed and filled, higher and higher, by self-luminous and brightly blazing entities.

Words meanings summery:

• उपरिष्टात् (upariṣṭāt) - higher (repeated for emphasis 'higher and higher') (above, on top, higher)

• उपरिष्टात् (upariṣṭāt) - higher (repeated for emphasis 'higher and higher') (above, on top, higher)

• तु (tu) - indeed (but, indeed, however)

• प्रज्वलद्भिः (prajvaladbhiḥ) - by brightly blazing entities (by brightly burning, by blazing)

• स्वयंप्रभैः (svayaṁprabhaiḥ) - by self-luminous entities (by self-luminous ones, by self-resplendent ones)

• निरुद्धम् (niruddham) - completely filled (blocked, obstructed, confined, filled)

• एतत् (etat) - this (space) (this, this one)

• आकाशम् (ākāśam) - space (ākāśa) (sky, space, ether)

• अप्रमेयम् (aprameyam) - immeasurable, not fathomable (immeasurable, incomprehensible, unknowable)

• सुरैः (suraiḥ) - even by the gods (by gods, by divinities)

• अपि (api) - even (also, even, too)

Words meanings and morphology

उपरिष्टात् (upariṣṭāt) - higher (repeated for emphasis 'higher and higher') (above, on top, higher)

(indeclinable)

From 'upari' (above) with ablative suffix '-tāt'

उपरिष्टात् (upariṣṭāt) - higher (repeated for emphasis 'higher and higher') (above, on top, higher)

(indeclinable)

From 'upari' (above) with ablative suffix '-tāt'

तु (tu) - indeed (but, indeed, however)

(indeclinable)

प्रज्वलद्भिः (prajvaladbhiḥ) - by brightly blazing entities (by brightly burning, by blazing)

(adjective)

Instrumental, masculine, plural of prajvalat

prajvalat - blazing, brightly burning, shining forth

Present Active Participle

From root 'jval' (to burn, shine) with upasarga 'pra-' (forth, intensely).

Prefix: pra

Root: jval (class 1)

Note: Agrees with 'svayampraphaiḥ'.

स्वयंप्रभैः (svayaṁprabhaiḥ) - by self-luminous entities (by self-luminous ones, by self-resplendent ones)

(adjective)

Instrumental, masculine, plural of svayaṃprabha

svayaṁprabha - self-luminous, self-resplendent, shining by oneself

Compound 'svayam' (by oneself) + 'prabha' (shining).

Compound type : bahuvrīhi (svayam+prabha)

• svayam – by oneself, automatically, spontaneously
  indeclinable
• prabha – light, splendor, radiance, shining
  noun (masculine)
  From root 'bhā' (to shine) with upasarga 'pra-'
  Prefix: pra
  Root: bhā (class 2)

Note: Agrees with 'prajvaladbhiḥ'.

निरुद्धम् (niruddham) - completely filled (blocked, obstructed, confined, filled)

(adjective)

Nominative, neuter, singular of niruddha

niruddha - blocked, obstructed, confined, suppressed, filled

Past Passive Participle

From root 'rudh' (to obstruct, block) with upasarga 'nir-' (completely).

Prefix: nis

Root: rudh (class 7)

Note: Agrees with 'ākāśam', acting as predicate.

एतत् (etat) - this (space) (this, this one)

(pronoun)

Nominative, neuter, singular of etad

etad - this, this one

Note: Agrees with 'ākāśam'.

आकाशम् (ākāśam) - space (ākāśa) (sky, space, ether)

(noun)

Nominative, neuter, singular of ākāśa

ākāśa - sky, atmosphere, space, ether, the fifth element

Prefix: ā

Root: kāś (class 1)

Note: Subject of the sentence.

अप्रमेयम् (aprameyam) - immeasurable, not fathomable (immeasurable, incomprehensible, unknowable)

(adjective)

Nominative, neuter, singular of aprameya

aprameya - immeasurable, unknowable, incomprehensible, that which cannot be proved

Gerundive/Future Passive Participle

From 'a-' (not) + 'prameya' (knowable, measurable). Prameya from 'pra-' + 'mā' (to measure, know).

Compound type : bahuvrīhi (a+prameya)

• a – not, un-
  indeclinable
  Negative prefix
• prameya – knowable, measurable, perceptible, an object of knowledge
  adjective (neuter)
  Gerundive/Future Passive Particlation
  From root 'mā' (to measure, know) with upasarga 'pra-' (forth, completely).
  Prefix: pra
  Root: mā (class 2)

Note: Agrees with 'ākāśam'.

सुरैः (suraiḥ) - even by the gods (by gods, by divinities)

(noun)

Instrumental, masculine, plural of sura

sura - god, deity

Note: Often indicates the agent in passive constructions, but here it's more like 'immeasurable to/by even the gods'.

अपि (api) - even (also, even, too)

(indeclinable)

Note: Emphasizes 'suraiḥ', meaning 'even by the gods'.