योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-92, verse-6

एकनाशे द्वयोरेव नाशोऽत्राभ्युपपद्यते ।
अवश्यं भवितुं मनोनाशे देहपरिक्षयः ॥ ६ ॥

ekanāśe dvayoreva nāśo'trābhyupapadyate ,
avaśyaṃ bhavituṃ manonāśe dehaparikṣayaḥ 6

6. eka-nāśe dvayoḥ eva nāśaḥ atra abhyupapadyate
| avaśyam bhavitum manas-nāśe deha-parikṣayaḥ

6. atra,
dvayoḥ eka-nāśe eva nāśaḥ abhyupapadyate.
manas-nāśe,
deha-parikṣayaḥ avaśyam bhavitum.

6. Here, it is accepted that upon the destruction of one of the two (mind or body), the destruction of both certainly follows. It is inevitable that with the destruction of the mind (manas), the body will decay.

Words meanings summery:

• एक-नाशे (eka-nāśe) - upon the destruction of one (of the two, mind or body) (upon the destruction of one)

• द्वयोः (dvayoḥ) - of the two (mind and body) (of the two)

• एव (eva) - certainly (indeed, only, certainly)

• नाशः (nāśaḥ) - destruction (of both) (destruction, ruin)

• अत्र (atra) - in this context (here, in this, in this context)

• अभ्युपपद्यते (abhyupapadyate) - is accepted, follows (is attained, is obtained, is accepted, follows, occurs)

• अवश्यम् (avaśyam) - necessarily, inevitably (necessarily, certainly, inevitably)

• भवितुम् (bhavitum) - to occur, to be (to be, to happen, to become)

• मनस्-नाशे (manas-nāśe) - upon the destruction of the mind (manas) (upon the destruction of the mind)

• देह-परिक्षयः (deha-parikṣayaḥ) - the decay of the body (decay/destruction of the body)

Words meanings and morphology

एक-नाशे (eka-nāśe) - upon the destruction of one (of the two, mind or body) (upon the destruction of one)

(noun)

Locative, masculine, singular of eka-nāśa

eka-nāśa - destruction of one, single destruction

Compound type : tatpurusha (eka+nāśa)

• eka – one, single
  numeral adjective
• nāśa – destruction, ruin, loss
  noun (masculine)
  Derived from root √naś (to perish, to be lost) with suffix -a.
  Root: naś (class 4)

द्वयोः (dvayoḥ) - of the two (mind and body) (of the two)

(pronoun)

Genitive, dual of dvi

dvi - two

Declension of 'dvi' (two).

Note: Can also be locative dual, but genitive makes more sense with "destruction of one of the two".

एव (eva) - certainly (indeed, only, certainly)

(indeclinable)

नाशः (nāśaḥ) - destruction (of both) (destruction, ruin)

(noun)

Nominative, masculine, singular of nāśa

nāśa - destruction, ruin, loss

Derived from root √naś (to perish, to be lost) with suffix -a.

Root: naś (class 4)

Note: The nominative case indicates it's the subject of 'abhyupapadyate'.

अत्र (atra) - in this context (here, in this, in this context)

(indeclinable)

Formed from 'idam' (this) + suffix -tra.

अभ्युपपद्यते (abhyupapadyate) - is accepted, follows (is attained, is obtained, is accepted, follows, occurs)

(verb)

3rd person , singular, middle, present (laṭ) of abhy-upa-pad

Present, middle voice, 3rd person singular.

Prefixes: abhi+upa

Root: pad (class 4)

Note: Often used impersonally or to express a logical consequence.

अवश्यम् (avaśyam) - necessarily, inevitably (necessarily, certainly, inevitably)

(indeclinable)

Accusative singular neuter of 'avaśya' (necessary) used adverbially.

भवितुम् (bhavitum) - to occur, to be (to be, to happen, to become)

(verb)

active, infinitive (tumun) of bhū

infinitive

Infinitive form of the root √bhū.

Root: bhū (class 1)

मनस्-नाशे (manas-nāśe) - upon the destruction of the mind (manas) (upon the destruction of the mind)

(noun)

Locative, masculine, singular of manas-nāśa

manas-nāśa - destruction of the mind

Compound type : tatpurusha (manas+nāśa)

• manas – mind, intellect, thought
  noun (neuter)
  Root: man (class 4)
• nāśa – destruction, ruin, loss
  noun (masculine)
  Derived from root √naś (to perish, to be lost) with suffix -a.
  Root: naś (class 4)

Note: The locative case indicates "when" or "upon" the destruction.

देह-परिक्षयः (deha-parikṣayaḥ) - the decay of the body (decay/destruction of the body)

(noun)

Nominative, masculine, singular of deha-parikṣaya

deha-parikṣaya - decay of the body, destruction of the body

Compound type : tatpurusha (deha+parikṣaya)

• deha – body, corporeal form
  noun (masculine)
  Root: dih (class 1)
• parikṣaya – decay, destruction, complete loss
  noun (masculine)
  Derived from prefix 'pari' and root 'kṣi' (to waste, destroy) with suffix -a.
  Prefix: pari
  Root: kṣi (class 1)

Note: The subject of 'bhavitum' (to be).