महाभारतः mahābhārataḥ - book-3, chapter-13, verse-48

विद्यातपोऽभितप्तानां तपसा भावितात्मनाम् ।
आत्मदर्शनसिद्धानामृषीणामृषिसत्तम ॥४८॥

48. vidyātapo'bhitaptānāṁ tapasā bhāvitātmanām ,
ātmadarśanasiddhānāmṛṣīṇāmṛṣisattama.

48. vidyātapaḥ abhitaptānām tapasā bhāvitātmanām
ātmadarśanasiddhānām ṛṣīṇām ṛṣisattama

48. O best among sages, among those who are purified by knowledge and spiritual discipline (tapas), whose inner selves (ātman) are developed through spiritual discipline (tapas), and who have attained perfection through the realization of the self (ātman).

Words meanings summery:

• विद्यातपः (vidyātapaḥ) - knowledge and spiritual discipline

• अभितप्तानाम् (abhitaptānām) - of those who are greatly purified / scorched

• तपसा (tapasā) - by austerity, by spiritual discipline

• भावितात्मनाम् (bhāvitātmanām) - of those whose selves (ātman) are cultivated/purified/developed

• आत्मदर्शनसिद्धानाम् (ātmadarśanasiddhānām) - of those who have attained perfection through the realization of the self (ātman)

• ऋषीणाम् (ṛṣīṇām) - of the sages

• ऋषिसत्तम (ṛṣisattama) - O best among sages

Words meanings and morphology

विद्यातपः (vidyātapaḥ) - knowledge and spiritual discipline

(noun)

Nominative, neuter, singular of vidyātapas

vidyātapas - knowledge and austerity/spiritual discipline

Compound type : dvandva (vidyā+tapas)

• vidyā – knowledge, learning, science
  noun (feminine)
  Root: vid (class 2)
• tapas – austerity, spiritual discipline, heat, penance (tapas)
  noun (neuter)
  Root: tap (class 1)

Note: Acts as the instrumental agent for the subsequent participle, meaning 'by knowledge and austerity'.

अभितप्तानाम् (abhitaptānām) - of those who are greatly purified / scorched

(adjective)

Genitive, masculine, plural of abhitapta

abhitapta - heated, scorched, purified, afflicted

Past Passive Participle

From prefix `abhi` + root `tap` (to heat, suffer)

Prefix: abhi

Root: tap (class 1)

Note: Qualifies `ṛṣīṇām`.

तपसा (tapasā) - by austerity, by spiritual discipline

(noun)

Instrumental, neuter, singular of tapas

tapas - austerity, spiritual discipline, heat, penance (tapas)

Root: tap (class 1)

भावितात्मनाम् (bhāvitātmanām) - of those whose selves (ātman) are cultivated/purified/developed

(adjective)

Genitive, masculine, plural of bhāvitātman

bhāvitātman - one whose self (ātman) is cultivated, purified, developed

Compound type : bahuvrīhi (bhāvita+ātman)

• bhāvita – caused to be, produced, cultivated, purified
  adjective (masculine)
  Past Passive Participle
  Causative of root `bhū`
  Root: bhū (class 1)
• ātman – self, soul, essence, spirit (ātman)
  noun (masculine)
  Root: an (class 2)

Note: Qualifies `ṛṣīṇām`.

आत्मदर्शनसिद्धानाम् (ātmadarśanasiddhānām) - of those who have attained perfection through the realization of the self (ātman)

(adjective)

Genitive, masculine, plural of ātmadarśanasiddha

ātmadarśanasiddha - one who has attained perfection through self-realization

Compound type : tatpuruṣa (ātmadarśana+siddha)

• ātman – self, soul, essence, spirit (ātman)
  noun (masculine)
  Root: an (class 2)
• darśana – seeing, vision, realization, philosophy
  noun (neuter)
  derived from root `dṛś` (to see)
  Root: dṛś (class 1)
• siddha – accomplished, perfected, realized, successful
  adjective (masculine)
  Past Passive Participle
  from root `sidh`
  Root: sidh (class 4)

Note: Qualifies `ṛṣīṇām`.

ऋषीणाम् (ṛṣīṇām) - of the sages

(noun)

Genitive, masculine, plural of ṛṣi

ṛṣi - sage, seer, inspired poet

Root: ṛṣ (class 1)

Note: The main noun being qualified by the preceding adjectives.

ऋषिसत्तम (ṛṣisattama) - O best among sages

(noun)

Vocative, masculine, singular of ṛṣisattama

ṛṣisattama - best among sages, highest sage

Compound type : tatpuruṣa (ṛṣi+sattama)

• ṛṣi – sage, seer, inspired poet
  noun (masculine)
  Root: ṛṣ (class 1)
• sattama – best, most excellent
  adjective (masculine)
  superlative suffix `tama`

Note: Directly addresses the deity.