महाभारतः mahābhārataḥ - book-12, chapter-181, verse-16

ब्राह्मणा धर्मतन्त्रस्थास्तपस्तेषां न नश्यति ।
ब्रह्म धारयतां नित्यं व्रतानि नियमांस्तथा ॥१६॥

16. brāhmaṇā dharmatantrasthāstapasteṣāṁ na naśyati ,
brahma dhārayatāṁ nityaṁ vratāni niyamāṁstathā.

16. brāhmaṇāḥ dharmatantrasthāḥ tapaḥ teṣām na naśyati
brahma dhārayatām nityam vratāni niyamān tathā

16. dharmatantrasthāḥ brāhmaṇāḥ teṣām tapaḥ na naśyati
nityam brahma vratāni tathā niyamān dhārayatām

16. For Brahmins who are established in the system of natural law (dharma), their austerity (tapas) does not perish. This holds true for those who constantly uphold the sacred knowledge (brahman), along with their vows and observances.

Words meanings summery:

• ब्राह्मणाः (brāhmaṇāḥ) - Brahmins

• धर्मतन्त्रस्थाः (dharmatantrasthāḥ) - established in the system of natural law

• तपः (tapaḥ) - austerity, penance, spiritual heat

• तेषाम् (teṣām) - their, of them

• न (na) - not

• नश्यति (naśyati) - perishes, is destroyed, disappears

• ब्रह्म (brahma) - sacred knowledge or the Veda (Brahman (the Absolute), sacred knowledge, Veda)

• धारयताम् (dhārayatām) - of those who uphold/maintain/bear

• नित्यम् (nityam) - constantly, always, perpetually

• व्रतानि (vratāni) - vows, sacred observances, religious practices

• नियमान् (niyamān) - observances, restraints, rules

• तथा (tathā) - and, likewise, so also

Words meanings and morphology

ब्राह्मणाः (brāhmaṇāḥ) - Brahmins

(noun)

Nominative, masculine, plural of brāhmaṇa

brāhmaṇa - Brahmin, relating to Brahman or the Veda

धर्मतन्त्रस्थाः (dharmatantrasthāḥ) - established in the system of natural law

(compound adjective)

Compound type : tatpuruṣa (dharma+tantra+stha)

• dharma – natural law, duty, righteousness
  noun (masculine)
  Root: dhṛ (class 1)
• tantra – system, doctrine, treatise, framework
  noun (neuter)
• stha – standing, abiding, situated in
  adjective (masculine)
  From root √sthā (to stand).
  Root: sthā (class 1)

तपः (tapaḥ) - austerity, penance, spiritual heat

(noun)

Nominative, neuter, singular of tapas

tapas - heat, warmth, austerity, penance, spiritual fervor

Root: tap (class 1)

तेषाम् (teṣām) - their, of them

(pronoun)

Genitive, masculine, plural of tad

tad - that, he, she, it

न (na) - not

(indeclinable)

नश्यति (naśyati) - perishes, is destroyed, disappears

(verb)

3rd person , singular, active, present indicative (lat) of naś

Present Indicative

Root √naś, class 4.

Root: naś (class 4)

ब्रह्म (brahma) - sacred knowledge or the Veda (Brahman (the Absolute), sacred knowledge, Veda)

(noun)

Accusative, neuter, singular of brahman

brahman - Brahman (the Absolute), sacred word, Veda, prayer

Root: bṛh (class 1)

धारयताम् (dhārayatām) - of those who uphold/maintain/bear

(adjective)

Genitive, masculine, plural of dhārayat

dhārayat - upholding, maintaining, bearing, carrying

Present Active Participle (Causative)

Present Active Participle of the causative stem of root √dhṛ (to hold, support).

Root: dhṛ (class 1)

नित्यम् (nityam) - constantly, always, perpetually

(indeclinable)

Note: Used adverbially in neuter singular.

व्रतानि (vratāni) - vows, sacred observances, religious practices

(noun)

Accusative, neuter, plural of vrata

vrata - vow, sacred observance, religious practice, rule

नियमान् (niyamān) - observances, restraints, rules

(noun)

Accusative, masculine, plural of niyama

niyama - restraint, control, observance, rule, fixed rule

Root: yam (class 1)

तथा (tathā) - and, likewise, so also

(indeclinable)