महाभारतः mahābhārataḥ - book-3, chapter-198, verse-20

धात्रा तु विहितं पूर्वं कर्म स्वं पालयाम्यहम् ।
प्रयत्नाच्च गुरू वृद्धौ शुश्रूषेऽहं द्विजोत्तम ॥२०॥

20. dhātrā tu vihitaṁ pūrvaṁ karma svaṁ pālayāmyaham ,
prayatnācca gurū vṛddhau śuśrūṣe'haṁ dvijottama.

20. dhātrā tu vihitam pūrvam karma svam pālayāmi aham
prayatnāt ca gurū vṛddhau śuśrūṣe aham dvijottama

20. Indeed, I uphold my own duty (karma), which was ordained by the Creator (dhātṛ) in the past. And I diligently serve my two aged parents (guru), O best of Brahmins (dvijottama).

Words meanings summery:

• धात्रा (dhātrā) - by the Creator (by the Creator, by the ordainer, by destiny)

• तु (tu) - indeed (but, indeed, however, on the other hand)

• विहितम् (vihitam) - ordained, prescribed, appointed

• पूर्वम् (pūrvam) - formerly, in the past (formerly, previously, in the past, eastern)

• कर्म (karma) - duty, prescribed action (karma) (action, deed, duty (karma))

• स्वम् (svam) - my own (duty) (my own, one's own)

• पालयामि (pālayāmi) - I uphold, I observe (I protect, I guard, I maintain, I observe)

• अहम् (aham) - I

• प्रयत्नात् (prayatnāt) - with effort, diligently, carefully

• च (ca) - and, also, moreover

• गुरू (gurū) - my two parents (two teachers, two elders, two parents (guru))

• वृद्धौ (vṛddhau) - two aged ones (referring to parents) (two old ones, two aged ones)

• शुश्रूषे (śuśrūṣe) - I serve (I serve, I desire to hear, I obey)

• अहम् (aham) - I

• द्विजोत्तम (dvijottama) - O best of Brahmins (dvijottama) (O best of the twice-born, O best Brahmin)

Words meanings and morphology

धात्रा (dhātrā) - by the Creator (by the Creator, by the ordainer, by destiny)

(noun)

Instrumental, masculine, singular of dhātṛ

dhātṛ - creator, ordainer, supporter, arranger; a name for Brahmā

Agent Noun

From root dhā (to place, create) + suffix -tṛ

Root: dhā (class 3)

Note: Agent of the passive participle 'vihitam'

तु (tu) - indeed (but, indeed, however, on the other hand)

(indeclinable)

Particle

विहितम् (vihitam) - ordained, prescribed, appointed

(adjective)

Nominative, neuter, singular of vihita

vihita - ordained, prescribed, arranged, performed

Past Passive Participle

From prefix vi- + root dhā (to place, arrange) + suffix -ta

Prefix: vi

Root: dhā (class 3)

Note: Agrees with 'karma'

पूर्वम् (pūrvam) - formerly, in the past (formerly, previously, in the past, eastern)

(indeclinable)

Adverbial form

Note: Adverb modifying 'vihitam'

कर्म (karma) - duty, prescribed action (karma) (action, deed, duty (karma))

(noun)

Accusative, neuter, singular of karma

karma - action, deed, work, ritual, fate, effect of actions (karma)

From root kṛ (to do, make) + suffix -man

Root: kṛ (class 8)

Note: Object of 'pālayāmi'

स्वम् (svam) - my own (duty) (my own, one's own)

(pronoun)

Accusative, neuter, singular of sva

sva - one's own, own (adjective/pronoun); wealth, property (noun)

Reflexive possessive pronoun/adjective

Note: Agrees with 'karma'

पालयामि (pālayāmi) - I uphold, I observe (I protect, I guard, I maintain, I observe)

(verb)

1st person , singular, active, present (laṭ) of pāl

Present Tense

From root pāl (10th class verb/causative of pā) in the 1st person singular, active voice, present tense

Root: pā (class 2)

अहम् (aham) - I

(pronoun)

Nominative, singular of asmad

asmad - I, we

Personal pronoun, nominative singular

Note: Subject of 'pālayāmi'

प्रयत्नात् (prayatnāt) - with effort, diligently, carefully

(indeclinable)

From prefix pra- + root yat (to strive) + suffix -na

Prefix: pra

Root: yat (class 1)

Note: Modifies 'śuśrūṣe'

च (ca) - and, also, moreover

(indeclinable)

Conjunction

गुरू (gurū) - my two parents (two teachers, two elders, two parents (guru))

(noun)

Nominative, masculine, dual of guru

guru - teacher, spiritual guide, elder, heavy, important (guru)

Note: Subject of implied sentence or object of 'śuśrūṣe' with accusative meaning

वृद्धौ (vṛddhau) - two aged ones (referring to parents) (two old ones, two aged ones)

(adjective)

Nominative, masculine, dual of vṛddha

vṛddha - old, aged, grown, increased

Past Passive Participle

From root vṛdh (to grow) + suffix -ta

Root: vṛdh (class 1)

Note: Agrees with 'gurū'

शुश्रूषे (śuśrūṣe) - I serve (I serve, I desire to hear, I obey)

(verb)

1st person , singular, middle, present (laṭ) of śuśrūṣ

Present Tense

Desiderative of root śru (to hear) + suffix sa + middle voice ending. Used transitively to mean "to serve". 1st person singular, middle voice, present tense.

Root: śru (class 5)

अहम् (aham) - I

(pronoun)

Nominative, singular of asmad

asmad - I, we

Personal pronoun, nominative singular

Note: Subject of 'śuśrūṣe'

द्विजोत्तम (dvijottama) - O best of Brahmins (dvijottama) (O best of the twice-born, O best Brahmin)

(noun)

Vocative, masculine, singular of dvijottama

dvijottama - best of the twice-born, best Brahmin

Compound type : tatpurusha (dvija+uttama)

• dvija – twice-born (Brahmin, Kṣatriya, Vaiśya); bird; tooth
  noun (masculine)
  Derived from dvi (twice) and root jan (to be born)
  Root: jan (class 4)
• uttama – best, highest, excellent, principal
  adjective (masculine)
  Superlative of ut or ud (up, out)

Note: Address to the Brahmin