योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-16, verse-3

काले पूर्वजया तन्वा तपः कृत्वा तया पुनः ।
गुरुत्वमसुरेन्द्राणां कर्तव्यं भवतानघ ॥ ३ ॥

kāle pūrvajayā tanvā tapaḥ kṛtvā tayā punaḥ ,
gurutvamasurendrāṇāṃ kartavyaṃ bhavatānagha 3

3. kāle pūrva-jayā tanvā tapaḥ kṛtvā tayā punaḥ
gurutvam asura-indrāṇām kartavyam bhavatā anagha

3. anagha kāle pūrva-jayā tanvā tapaḥ kṛtvā tayā
punaḥ asura-indrāṇām gurutvam bhavatā kartavyam

3. O sinless one, having performed asceticism (tapas) with that former body, you must again undertake the position of preceptor (guru) for the lords of asuras in due course.

Words meanings summery:

• काले (kāle) - In due course, at the right time. (in time, at the proper time, at that time.)

• पूर्व-जया (pūrva-jayā) - By the former (body). (by the former, by the previous, by the one born first (feminine instrumental).)

• तन्वा (tanvā) - By that former body (of the female ascetic Samaṅgā). (by the body.)

• तपः (tapaḥ) - Asceticism (tapas). (asceticism, penance, heat.)

• कृत्वा (kṛtvā) - Having performed (asceticism). (having done, having made, having performed.)

• तया (tayā) - With that (body, the female ascetic's body). (by her, by that (feminine instrumental singular).)

• पुनः (punaḥ) - Again. (again, once more, back, moreover.)

• गुरुत्वम् (gurutvam) - The position/state of being a preceptor (guru). (the state of being a preceptor/guru, gravity, importance.)

• असुर-इन्द्राणाम् (asura-indrāṇām) - Of the lords of asuras. (of the lords of asuras, of the chief asuras.)

• कर्तव्यम् (kartavyam) - Must be undertaken. (to be done, to be performed, must be done.)

• भवता (bhavatā) - By you (referring to Śukra). (by you, by your honor.)

• अनघ (anagha) - O sinless one (vocative, addressing Śukra). (sinless, faultless, pure.)

Words meanings and morphology

काले (kāle) - In due course, at the right time. (in time, at the proper time, at that time.)

(noun)

Locative, masculine, singular of kāla

kāla - time, period, season.

पूर्व-जया (pūrva-jayā) - By the former (body). (by the former, by the previous, by the one born first (feminine instrumental).)

(adjective)

Instrumental, feminine, singular of pūrva-ja

pūrva-ja - born before, former, prior.

Tatpuruṣa compound, from `pūrva` (former) and `ja` (born).

Compound type : tatpuruṣa (pūrva+ja)

• pūrva – former, prior, earlier, eastern.
  adjective (masculine)
• ja – born, produced from.
  adjective (masculine)
  From root `jan` (to be born).
  Root: jan (class 4)

Note: Refers to `tanvā`.

तन्वा (tanvā) - By that former body (of the female ascetic Samaṅgā). (by the body.)

(noun)

Instrumental, feminine, singular of tanu

tanu - body, limb, form, person.

U-stem noun.

Root: tan

तपः (tapaḥ) - Asceticism (tapas). (asceticism, penance, heat.)

(noun)

Accusative, neuter, singular of tapas

tapas - heat, warmth; asceticism, penance, spiritual austerity (tapas).

R-stem noun.

Root: tap

Note: Object of `kṛtvā`.

कृत्वा (kṛtvā) - Having performed (asceticism). (having done, having made, having performed.)

(indeclinable)

Absolutive (gerund)

Formed with suffix `-tvā`.

Root: kṛ (class 8)

तया (tayā) - With that (body, the female ascetic's body). (by her, by that (feminine instrumental singular).)

(pronoun)

Instrumental, feminine, singular of tad

tad - that, she, it.

Demonstrative pronoun.

Note: Agrees with `tanvā`.

पुनः (punaḥ) - Again. (again, once more, back, moreover.)

(indeclinable)

गुरुत्वम् (gurutvam) - The position/state of being a preceptor (guru). (the state of being a preceptor/guru, gravity, importance.)

(noun)

Accusative, neuter, singular of gurutva

gurutva - guru-ship, position of a teacher, gravity, importance, venerableness.

Formed from `guru` + suffix ` -tva`.

Note: Object of `kartavyam`.

असुर-इन्द्राणाम् (asura-indrāṇām) - Of the lords of asuras. (of the lords of asuras, of the chief asuras.)

(noun)

Genitive, masculine, plural of asura-indra

asura-indra - chief of asuras, lord of asuras.

Tatpuruṣa compound (genitive/possessive).

Compound type : tatpuruṣa (asura+indra)

• asura – demon, titan, anti-god.
  noun (masculine)
• indra – chief, lord, king; the god Indra.
  noun (masculine)

कर्तव्यम् (kartavyam) - Must be undertaken. (to be done, to be performed, must be done.)

(adjective)

Nominative, neuter, singular of kṛ

kṛ - to do, make, perform, accomplish.

Gerundive (Potential Passive Participle)

Formed with suffix `-tavya`. Neuter nominative/accusative singular.

Root: kṛ (class 8)

Note: Predicative adjective.

भवता (bhavatā) - By you (referring to Śukra). (by you, by your honor.)

(pronoun)

Instrumental, masculine, singular of bhavat

bhavat - you (respectful form), being, existing.

Present active participle

Masculine instrumental singular of the polite pronoun `bhavat`. Derived from root `bhū`.

Root: bhū (class 1)

अनघ (anagha) - O sinless one (vocative, addressing Śukra). (sinless, faultless, pure.)

(adjective)

Vocative, masculine, singular of anagha

anagha - sinless, faultless, pure, innocent.

Bahuvrīhi compound: `a-` (not) + `agha` (sin, fault).

Compound type : bahuvrīhi (a+agha)

• a – not, un-, in-.
  indeclinable
  Negative prefix.
• agha – sin, evil, distress, fault.
  noun (neuter)