महाभारतः mahābhārataḥ - book-5, chapter-20, verse-3

सर्वैर्भवद्भिर्विदितो राजधर्मः सनातनः ।
वाक्योपादानहेतोस्तु वक्ष्यामि विदिते सति ॥३॥

3. sarvairbhavadbhirvidito rājadharmaḥ sanātanaḥ ,
vākyopādānahetostu vakṣyāmi vidite sati.

3. sarvaiḥ bhavadbhiḥ viditaḥ rājadharmaḥ sanātanaḥ
vākyopādānahetoḥ tu vakṣyāmi vidite sati

3. The eternal (sanātana) royal constitution (rājadharma) is known to all of you. Nevertheless, for the purpose of delivering this message, I will speak, even though it is already known.

Words meanings summery:

• सर्वैः (sarvaiḥ) - by all

• भवद्भिः (bhavadbhiḥ) - by your honors, by you all

• विदितः (viditaḥ) - known, understood

• राजधर्मः (rājadharmaḥ) - royal duty, the (intrinsic nature) dharma of a king, natural law of kingship

• सनातनः (sanātanaḥ) - eternal, perpetual, ancient

• वाक्योपादानहेतोः (vākyopādānahetoḥ) - for the sake of conveying the message, for the purpose of introducing the speech

• तु (tu) - but, indeed, however

• वक्ष्यामि (vakṣyāmi) - I will speak, I will say

• विदिते (vidite) - though known, when known, being known

• सति (sati) - being, existing, when it is so

Words meanings and morphology

सर्वैः (sarvaiḥ) - by all

(pronoun)

Instrumental, masculine, plural of sarva

sarva - all, every, whole, entire

भवद्भिः (bhavadbhiḥ) - by your honors, by you all

(pronoun)

Instrumental, masculine, plural of bhavat

bhavat - your honor, you (polite address), being, existing (present participle of as)

Present Active Participle (when from root bhū)

विदितः (viditaḥ) - known, understood

(adjective)

Nominative, masculine, singular of vidita

vidita - known, understood, revealed, perceived

Past Passive Participle

formed from root vid (to know) + kta

Root: vid (class 2)

राजधर्मः (rājadharmaḥ) - royal duty, the (intrinsic nature) dharma of a king, natural law of kingship

(noun)

Nominative, masculine, singular of rājadharma

rājadharma - duty of a king, royal law, king's constitution (dharma)

Compound type : ṣaṣṭhī-tatpuruṣa (rājan+dharma)

• rājan – king, ruler
  noun (masculine)
• dharma – duty, righteousness, law, constitution, intrinsic nature, moral order
  noun (masculine)
  Root: dhṛ (class 1)

सनातनः (sanātanaḥ) - eternal, perpetual, ancient

(adjective)

Nominative, masculine, singular of sanātana

sanātana - eternal, perpetual, ancient, everlasting, traditional

from sadā (always) + tana (suffix)

वाक्योपादानहेतोः (vākyopādānahetoḥ) - for the sake of conveying the message, for the purpose of introducing the speech

(noun)

Genitive, masculine, singular of vākyopādānahetu

vākyopādānahetu - reason for taking up speech/message, cause for uttering words

Compound type : ṣaṣṭhī-tatpuruṣa (vākya+upādāna+hetu)

• vākya – speech, statement, message
  noun (neuter)
• upādāna – taking up, acquiring, cause, material cause
  noun (neuter)
  verbal noun
  from prefix upa-ā- + root dā (to give, take)
  Prefixes: upa+ā
  Root: dā (class 3)
• hetu – cause, reason, motive
  noun (masculine)
  Root: hi (class 5)

Note: Can also be considered ablative in function for 'for the sake of'

तु (tu) - but, indeed, however

(indeclinable)

वक्ष्यामि (vakṣyāmi) - I will speak, I will say

(verb)

1st person , singular, active, Future (Lṛṭ) of vac

Future tense (Lṛṭ Lakara) 1st person singular active

Root: vac (class 2)

विदिते (vidite) - though known, when known, being known

(adjective)

Locative, neuter, singular of vidita

vidita - known, understood, revealed, perceived

Past Passive Participle

formed from root vid (to know) + kta

Root: vid (class 2)

Note: Part of a locative absolute construction 'vidite sati'

सति (sati) - being, existing, when it is so

(adjective)

Locative, neuter, singular of sat

sat - being, existing, true, good

Present Active Participle

formed from root as (to be) + śatṛ

Root: as (class 2)

Note: Part of a locative absolute construction 'vidite sati' meaning 'even though it is known/existing'