महाभारतः mahābhārataḥ - book-3, chapter-141, verse-13

तथैव सहदेवोऽयं सततं त्वामनुव्रतः ।
न जातु विनिवर्तेत मतज्ञो ह्यहमस्य वै ॥१३॥

13. tathaiva sahadevo'yaṁ satataṁ tvāmanuvrataḥ ,
na jātu vinivarteta matajño hyahamasya vai.

13. tathā eva sahadevaḥ ayam satatam tvām anuvrataḥ
na jātu vinivarteta matajñaḥ hi aham asya vai

13. Likewise, this Sahadeva is constantly devoted to you. He would never return, for I surely understand his intentions.

Words meanings summery:

• तथा (tathā) - thus, so, in that manner

• एव (eva) - just, exactly, indeed

• सहदेवः (sahadevaḥ) - One of the Pāṇḍavas. (Sahadeva)

• अयम् (ayam) - Refers to Sahadeva. (this)

• सततम् (satatam) - always, constantly

• त्वाम् (tvām) - you

• अनुव्रतः (anuvrataḥ) - Refers to Sahadeva's devotion to Rāma. (devoted, following, obedient)

• न (na) - not, no

• जातु (jātu) - Used with 'na' to mean 'never'. (ever, at any time)

• विनिवर्तेत (vinivarteta) - he would return, he would go back

• मतज्ञः (matajñaḥ) - The speaker (Lakṣmaṇa) states he knows Sahadeva's intentions. (knowing the mind, understanding intentions)

• हि (hi) - indeed, surely, because

• अहम् (aham) - I

• अस्य (asya) - Refers to Sahadeva. (his, of this)

• वै (vai) - indeed, surely

Words meanings and morphology

तथा (tathā) - thus, so, in that manner

(indeclinable)

Adverb.

एव (eva) - just, exactly, indeed

(indeclinable)

Emphatic particle.

सहदेवः (sahadevaḥ) - One of the Pāṇḍavas. (Sahadeva)

(proper noun)

Nominative, masculine, singular of sahadeva

sahadeva - Sahadeva (proper noun)

Name of the youngest Pāṇḍava.

अयम् (ayam) - Refers to Sahadeva. (this)

(pronoun)

Nominative, masculine, singular of idam

idam - this

Demonstrative pronoun.

सततम् (satatam) - always, constantly

(indeclinable)

Adverbial accusative of satata or an indeclinable form.

Root: as (class 2)

Note: Accusative singular neuter of satata, used adverbially.

त्वाम् (tvām) - you

(pronoun)

Accusative, singular of yuṣmad

yuṣmad - you, ye

Second person pronoun.

अनुव्रतः (anuvrataḥ) - Refers to Sahadeva's devotion to Rāma. (devoted, following, obedient)

(adjective)

Nominative, masculine, singular of anuvrata

anuvrata - devoted, following, obedient, faithful

From prefix anu- + vrata (vow). One who follows vows or another person.

Compound type : karmadhāraya (anu+vrata)

• anu – after, along, near, devoted to
  indeclinable
• vrata – vow, sacred observance, devotion
  noun (neuter)

Note: Predicative adjective for Sahadeva.

न (na) - not, no

(indeclinable)

जातु (jātu) - Used with 'na' to mean 'never'. (ever, at any time)

(indeclinable)

Adverb of time. Often occurs with the negative particle na.

Root: jan

विनिवर्तेत (vinivarteta) - he would return, he would go back

(verb)

3rd person , singular, middle, optative (vidhiliṅ) of vṛt

Optative Middle (ātmanepada)

3rd person singular. Root vṛt (1st class) with prefixes vi- and ni-.

Prefixes: vi+ni

Root: vṛt (class 1)

Note: The subject is Sahadeva.

मतज्ञः (matajñaḥ) - The speaker (Lakṣmaṇa) states he knows Sahadeva's intentions. (knowing the mind, understanding intentions)

(adjective)

Nominative, masculine, singular of matajña

matajña - knowing the mind, knowing opinions, understanding intentions

From mata (thought, opinion) + jña (knowing).

Compound type : ṣaṣṭhī-tatpuruṣa (mata+jña)

• mata – thought, opinion, intention, known, considered
  noun/adjective (neuter)
  Past Passive Participle
  From root man (to think).
  Root: man (class 4)
• jña – knowing, knower of
  adjective/noun (masculine)
  Agent noun/adjective from root jñā
  Derived from root jñā (to know) + ka suffix.
  Root: jñā (class 9)

Note: Predicative adjective for 'aham'.

हि (hi) - indeed, surely, because

(indeclinable)

अहम् (aham) - I

(pronoun)

Nominative, singular of asmad

asmad - I, we

First person pronoun.

अस्य (asya) - Refers to Sahadeva. (his, of this)

(pronoun)

Genitive, masculine, singular of idam

idam - this

Demonstrative pronoun.

वै (vai) - indeed, surely

(indeclinable)

Particle.