महाभारतः mahābhārataḥ - book-6, chapter-3, verse-28

चतुर्दशीं पञ्चदशीं भूतपूर्वां च षोडशीम् ।
इमां तु नाभिजानामि अमावास्यां त्रयोदशीम् ॥२८॥

28. caturdaśīṁ pañcadaśīṁ bhūtapūrvāṁ ca ṣoḍaśīm ,
imāṁ tu nābhijānāmi amāvāsyāṁ trayodaśīm.

28. caturdaśīm pañcadaśīm bhūtapūrvām ca ṣoḍaśīm
imām tu na abhijānāmi amāvāsyām trayodaśīm

28. aham caturdaśīm,
pañcadaśīm,
bhūtapūrvām ca ṣoḍaśīm (ca) abhijānāmi; tu imām trayodaśīm amāvāsyām na abhijānāmi

28. I know the fourteenth, the fifteenth, and even the sixteenth day which occurred previously, but I do not know this new moon (amāvāsyā) on the thirteenth day.

Words meanings summery:

• चतुर्दशीम् (caturdaśīm) - the fourteenth lunar day (the fourteenth day)

• पञ्चदशीम् (pañcadaśīm) - the fifteenth lunar day (the fifteenth day)

• भूतपूर्वाम् (bhūtapūrvām) - that which was before, formerly existing

• च (ca) - and, also

• षोडशीम् (ṣoḍaśīm) - the sixteenth lunar day (the sixteenth day)

• इमाम् (imām) - this, this one

• तु (tu) - but, indeed, however

• न (na) - not, no

• अभिजानामि (abhijānāmi) - I know, I recognize

• अमावास्याम् (amāvāsyām) - the new moon day

• त्रयोदशीम् (trayodaśīm) - the thirteenth lunar day (the thirteenth day)

Words meanings and morphology

चतुर्दशीम् (caturdaśīm) - the fourteenth lunar day (the fourteenth day)

(noun)

Accusative, feminine, singular of caturdaśī

caturdaśī - the fourteenth day of the lunar fortnight

पञ्चदशीम् (pañcadaśīm) - the fifteenth lunar day (the fifteenth day)

(noun)

Accusative, feminine, singular of pañcadaśī

pañcadaśī - the fifteenth day of the lunar fortnight

भूतपूर्वाम् (bhūtapūrvām) - that which was before, formerly existing

(adjective)

Accusative, feminine, singular of bhūtapūrvā

bhūtapūrvā - that which existed before, formerly existing

Compound type : tatpuruṣa (bhūta+pūrvā)

• bhūta – been, become, past, existing, creature
  participle (masculine)
  Past Passive Participle
  Derived from the root bhū (to be)
  Root: bhū (class 1)
• pūrvā – former, prior, eastern, earlier
  adjective (feminine)

Note: Modifies 'ṣoḍaśīm'

च (ca) - and, also

(indeclinable)

षोडशीम् (ṣoḍaśīm) - the sixteenth lunar day (the sixteenth day)

(noun)

Accusative, feminine, singular of ṣoḍaśī

ṣoḍaśī - the sixteenth day of the lunar fortnight

इमाम् (imām) - this, this one

(pronoun)

Accusative, feminine, singular of idam

idam - this, this one

Note: Modifies 'amāvāsyām'

तु (tu) - but, indeed, however

(indeclinable)

न (na) - not, no

(indeclinable)

अभिजानामि (abhijānāmi) - I know, I recognize

(verb)

1st person , singular, active, present (lat) of abhijñā

Prefix: abhi

Root: jñā (class 9)

अमावास्याम् (amāvāsyām) - the new moon day

(noun)

Accusative, feminine, singular of amāvāsyā

amāvāsyā - new moon day

त्रयोदशीम् (trayodaśīm) - the thirteenth lunar day (the thirteenth day)

(noun)

Accusative, feminine, singular of trayodaśī

trayodaśī - the thirteenth day of the lunar fortnight

Note: Used here as an adjective modifying 'amāvāsyām' or a temporal accusative.