महाभारतः mahābhārataḥ - book-3, chapter-13, verse-15

क्षेत्रज्ञः सर्वभूतानामादिरन्तश्च केशव ।
निधानं तपसां कृष्ण यज्ञस्त्वं च सनातनः ॥१५॥

15. kṣetrajñaḥ sarvabhūtānāmādirantaśca keśava ,
nidhānaṁ tapasāṁ kṛṣṇa yajñastvaṁ ca sanātanaḥ.

15. kṣetrajñaḥ sarvabhūtānām ādiḥ antaḥ ca keśava
nidhānam tapasām kṛṣṇa yajñaḥ tvam ca sanātanaḥ

15. O Kesava, you are the knower of the field (kṣetrajña) of all beings, their beginning and their end. O Krishna, you are the storehouse of all penances (tapas) and the eternal Vedic ritual (yajña).

Words meanings summery:

• क्षेत्रज्ञः (kṣetrajñaḥ) - the supreme consciousness, the 'Self' (puruṣa) (knower of the field/body/soul)

• सर्वभूतानाम् (sarvabhūtānām) - of all beings, of all creatures

• आदिः (ādiḥ) - beginning, origin

• अन्तः (antaḥ) - end, conclusion

• च (ca) - and, also

• केशव (keśava) - O Kesava (vocative) (Kesava (an epithet of Vishnu/Krishna))

• निधानम् (nidhānam) - storehouse, receptacle, treasury

• तपसाम् (tapasām) - of penances, of austerities

• कृष्ण (kṛṣṇa) - O Krishna (vocative) (Krishna)

• यज्ञः (yajñaḥ) - sacrifice

• त्वम् (tvam) - you

• च (ca) - and, also

• सनातनः (sanātanaḥ) - eternal, everlasting

Words meanings and morphology

क्षेत्रज्ञः (kṣetrajñaḥ) - the supreme consciousness, the 'Self' (puruṣa) (knower of the field/body/soul)

(noun)

Nominative, masculine, singular of kṣetrajña

kṣetrajña - knower of the field; the individual soul (ātman); the Supreme Spirit (puruṣa); consciousness

Compound type : tatpuruṣa (kṣetra+jña)

• kṣetra – field, body, sacred place, sphere of action
  noun (neuter)
• jña – knowing, acquainted with, expert in, a knower
  adjective
  Agent noun
  Derived from the root 'jñā' (to know)
  Root: jñā (class 9)

सर्वभूतानाम् (sarvabhūtānām) - of all beings, of all creatures

(noun)

Genitive, neuter, plural of sarvabhūta

sarvabhūta - all beings, all creatures, the entire creation

Compound type : karmadhāraya (sarva+bhūta)

• sarva – all, every, entire, whole
  pronoun
• bhūta – being, creature, element, existing, past
  noun (neuter)
  Past Passive Participle
  Past Passive Participle from the root 'bhū' (to be)
  Root: bhū (class 1)

आदिः (ādiḥ) - beginning, origin

(noun)

Nominative, masculine, singular of ādi

ādi - beginning, origin, first, prime, initial

अन्तः (antaḥ) - end, conclusion

(noun)

Nominative, masculine, singular of anta

anta - end, limit, conclusion, death, border

च (ca) - and, also

(indeclinable)

केशव (keśava) - O Kesava (vocative) (Kesava (an epithet of Vishnu/Krishna))

(proper noun)

Vocative, masculine, singular of keśava

keśava - having long hair; an epithet of Krishna or Vishnu; slayer of the demon Keśī

निधानम् (nidhānam) - storehouse, receptacle, treasury

(noun)

Nominative, neuter, singular of nidhāna

nidhāna - deposit, treasure, receptacle, storehouse, foundation, place of rest

Prefix: ni

Root: dhā (class 3)

तपसाम् (tapasām) - of penances, of austerities

(noun)

Genitive, neuter, plural of tapas

tapas - heat, penance, asceticism, religious austerity, spiritual fervor

Root: tap (class 1)

कृष्ण (kṛṣṇa) - O Krishna (vocative) (Krishna)

(proper noun)

Vocative, masculine, singular of kṛṣṇa

kṛṣṇa - dark, black; Krishna (name of a deity, avatar of Vishnu)

यज्ञः (yajñaḥ) - sacrifice

(noun)

Nominative, masculine, singular of yajña

yajña - sacrifice, worship, ritual offering, sacred rite

Root: yaj (class 1)

त्वम् (tvam) - you

(pronoun)

Nominative, singular of yuṣmad

yuṣmad - you (2nd person pronoun)

च (ca) - and, also

(indeclinable)

सनातनः (sanātanaḥ) - eternal, everlasting

(adjective)

Nominative, masculine, singular of sanātana

sanātana - eternal, perpetual, ancient, primeval, everlasting