योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-133, verse-8

स्वात्मनो नाशमाशंक्य सद्वीपभुवनैः सह ।
अवश्यभाविपार्श्वस्थमहमग्निमथाविशम् ॥ ८ ॥

svātmano nāśamāśaṃkya sadvīpabhuvanaiḥ saha ,
avaśyabhāvipārśvasthamahamagnimathāviśam 8

8. svātmanaḥ nāśam āśaṅkya sa-dvīpabhuvanaiḥ saha
avaśyabhāvipārśvastham aham agnim atha āviśam

8. aham sa-dvīpabhuvanaiḥ saha svātmanaḥ nāśam
āśaṅkya atha avaśyabhāvipārśvastham agnim āviśam

8. Fearing the destruction of my own being (ātman) along with all the islands and worlds, I then entered the fire (agni) that was inevitably present by my side.

Words meanings summery:

• स्वात्मनः (svātmanaḥ) - of my own being (ātman) (of my own self, of one's own soul (ātman))

• नाशम् (nāśam) - destruction, loss, annihilation

• आशङ्क्य (āśaṅkya) - fearing (having feared, having apprehended, fearing)

• स-द्वीपभुवनैः (sa-dvīpabhuvanaiḥ) - along with the islands and worlds

• सह (saha) - with, along with

• अवश्यभाविपार्श्वस्थम् (avaśyabhāvipārśvastham) - that was inevitably present by my side (who was certainly destined to be near, standing inevitably by the side)

• अहम् (aham) - I

• अग्निम् (agnim) - the fire (agni)

• अथ (atha) - then (then, now, moreover)

• आविशम् (āviśam) - I entered

Words meanings and morphology

स्वात्मनः (svātmanaḥ) - of my own being (ātman) (of my own self, of one's own soul (ātman))

(noun)

Genitive, masculine, singular of svātman

svātman - one's own self, individual soul, ego (ātman)

Compound of 'sva' (own) + 'ātman' (self)

Compound type : tatpuruṣa (sva+ātman)

• sva – own, self, one's own
  adjective
• ātman – self, soul, essence, spirit (ātman)
  noun (masculine)
  Root: an (class 2)

नाशम् (nāśam) - destruction, loss, annihilation

(noun)

Accusative, masculine, singular of nāśa

nāśa - destruction, ruin, loss, disappearance

From root 'naś' (to perish)

Root: naś (class 4)

Note: Object of 'āśaṅkya' (implied action)

आशङ्क्य (āśaṅkya) - fearing (having feared, having apprehended, fearing)

(indeclinable)

Absolutive (gerund)

From root 'śaṅk' (to doubt, fear) with prefix 'ā'

Prefix: ā

Root: śaṅk (class 1)

Note: Expresses a prior action by the subject

स-द्वीपभुवनैः (sa-dvīpabhuvanaiḥ) - along with the islands and worlds

(adjective)

Instrumental, neuter, plural of sa-dvīpabhuvana

sa-dvīpabhuvana - with its islands and worlds

Compound: 'sa' (with) + 'dvīpa' (island) + 'bhuvana' (world)

Compound type : bahuvrīhi (sa+dvīpa+bhuvana)

• sa – with, accompanied by
  prefix
  Short form of 'saha'
• dvīpa – island, continent
  noun (masculine)
• bhuvana – world, realm, being
  noun (neuter)
  From root 'bhū' (to be)
  Root: bhū (class 1)

Note: Adjective modifying the implied objects of destruction, agreeing with 'saha'

सह (saha) - with, along with

(indeclinable)

Governs instrumental case

अवश्यभाविपार्श्वस्थम् (avaśyabhāvipārśvastham) - that was inevitably present by my side (who was certainly destined to be near, standing inevitably by the side)

(adjective)

Accusative, masculine, singular of avaśyabhāvipārśvastha

avaśyabhāvipārśvastha - standing inevitably by the side, whose presence is unavoidable

Compound describing 'agni'

Compound type : tatpuruṣa (avaśyabhāvin+pārśvastha)

• avaśyabhāvin – inevitable, certain to happen, destined
  adjective
  future participle
  'avaśya' (necessarily) + 'bhāvin' (going to be, future participle from 'bhū')
  Root: bhū (class 1)
• pārśvastha – standing near, being by the side, adjacent
  adjective
  'pārśva' (side) + 'stha' (standing/being)
  Root: sthā (class 1)

Note: Adjective modifying 'agnim'

अहम् (aham) - I

(pronoun)

Nominative, singular of aham

aham - I, myself

1st person singular pronoun

Note: Subject of 'āviśam'

अग्निम् (agnim) - the fire (agni)

(noun)

Accusative, masculine, singular of agni

agni - fire, god of fire (agni)

Root: ag

Note: Object of 'āviśam'

अथ (atha) - then (then, now, moreover)

(indeclinable)

Particle indicating sequence or commencement

आविशम् (āviśam) - I entered

(verb)

1st person , singular, active, imperfect indicative (laṅ) of āviś

Imperfect active indicative

1st person singular, imperfect tense, active voice, from root 'viś' with prefix 'ā'

Prefix: ā

Root: viś (class 6)