महाभारतः mahābhārataḥ - book-12, chapter-128, verse-30

परस्पराभिसंरक्षा राज्ञा राष्ट्रेण चापदि ।
नित्यमेवेह कर्तव्या एष धर्मः सनातनः ॥३०॥

30. parasparābhisaṁrakṣā rājñā rāṣṭreṇa cāpadi ,
nityameveha kartavyā eṣa dharmaḥ sanātanaḥ.

30. parasparābhisaṃrakṣā rājñā rāṣṭreṇa ca āpadi
nityam eva iha kartavyā eṣaḥ dharmaḥ sanātanaḥ

30. āpadi rājñā ca rāṣṭreṇa parasparābhisaṃrakṣā
iha nityam eva kartavyā eṣaḥ sanātanaḥ dharmaḥ

30. In times of distress, the king and the state must always provide mutual protection to each other. This is the eternal natural law (dharma).

Words meanings summery:

• परस्पराभिसंरक्षा (parasparābhisaṁrakṣā) - mutual protection, reciprocal defense

• राज्ञा (rājñā) - by the king

• राष्ट्रेण (rāṣṭreṇa) - by the kingdom, by the state, by the nation

• च (ca) - and, also

• आपदि (āpadi) - in distress, in calamity, in difficulty

• नित्यम् (nityam) - always, constantly, perpetually

• एव (eva) - indeed, only, certainly

• इह (iha) - here, in this world, in this matter

• कर्तव्या (kartavyā) - to be done, ought to be performed

• एषः (eṣaḥ) - this, this one

• धर्मः (dharmaḥ) - natural law (dharma) (natural law, constitution, duty, righteousness)

• सनातनः (sanātanaḥ) - eternal, ancient, everlasting

Words meanings and morphology

परस्पराभिसंरक्षा (parasparābhisaṁrakṣā) - mutual protection, reciprocal defense

(noun)

Nominative, feminine, singular of parasparābhisaṃrakṣā

parasparābhisaṁrakṣā - mutual protection, reciprocal defense

Compound type : tatpuruṣa (paraspara+abhisaṃrakṣā)

• paraspara – mutual, reciprocal
  adjective (masculine)
• abhisaṃrakṣā – protection, defense
  noun (feminine)
  from root rakṣ (to protect) with prefixes abhi and sam
  Prefixes: abhi+sam
  Root: rakṣ (class 1)

राज्ञा (rājñā) - by the king

(noun)

Instrumental, masculine, singular of rājan

rājan - king, ruler, sovereign

राष्ट्रेण (rāṣṭreṇa) - by the kingdom, by the state, by the nation

(noun)

Instrumental, neuter, singular of rāṣṭra

rāṣṭra - kingdom, state, nation, country, empire

च (ca) - and, also

(indeclinable)

आपदि (āpadi) - in distress, in calamity, in difficulty

(noun)

Locative, feminine, singular of āpad

āpad - calamity, distress, misfortune, danger

नित्यम् (nityam) - always, constantly, perpetually

(indeclinable)

Note: Used adverbially here

एव (eva) - indeed, only, certainly

(indeclinable)

इह (iha) - here, in this world, in this matter

(indeclinable)

कर्तव्या (kartavyā) - to be done, ought to be performed

(adjective)

Nominative, feminine, singular of kartavya

kartavya - to be done, proper to be done, obligatory, fit for use

Gerundive

from root kṛ (to do)

Root: kṛ (class 8)

एषः (eṣaḥ) - this, this one

(pronoun)

Nominative, masculine, singular of etad

etad - this

धर्मः (dharmaḥ) - natural law (dharma) (natural law, constitution, duty, righteousness)

(noun)

Nominative, masculine, singular of dharma

dharma - duty, righteousness, virtue, natural law, intrinsic nature, constitution, religion, law

सनातनः (sanātanaḥ) - eternal, ancient, everlasting

(adjective)

Nominative, masculine, singular of sanātana

sanātana - eternal, perpetual, ancient, primeval