योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-124, verse-16

क्षालयन्ति मलेनैव मलं क्षालनकोविदाः ।
वारयन्त्यस्त्रमस्त्रेण विषं प्रति विषेण च ॥ १६ ॥

kṣālayanti malenaiva malaṃ kṣālanakovidāḥ ,
vārayantyastramastreṇa viṣaṃ prati viṣeṇa ca 16

16. kṣālayanti malena eva malaṃ kṣālanakovidāḥ
vārayanti astram astreṇa viṣam prati viṣeṇa ca

16. kṣālanakovidāḥ malena eva malaṃ kṣālayanti
astram astreṇa vārayanti viṣam prati viṣeṇa ca

16. Those skilled in purification cleanse impurity with impurity itself. They repel a weapon with a weapon, and poison with poison.

Words meanings summery:

• क्षालयन्ति (kṣālayanti) - they cleanse, they wash, they purify

• मलेन (malena) - by dirt, with impurity, by defilement

• एव (eva) - itself, indeed, only

• मलं (malaṁ) - dirt, impurity, defilement

• क्षालनकोविदाः (kṣālanakovidāḥ) - those skilled in cleansing/purification

• वारयन्ति (vārayanti) - they repel, they ward off, they prevent

• अस्त्रम् (astram) - a weapon, a missile

• अस्त्रेण (astreṇa) - with a weapon, by a missile

• विषम् (viṣam) - poison

• प्रति (prati) - against, towards, in return for

• विषेण (viṣeṇa) - with poison

• च (ca) - and, also

Words meanings and morphology

क्षालयन्ति (kṣālayanti) - they cleanse, they wash, they purify

(verb)

3rd person , plural, active, present (laṭ) of kṣālaya

causative

Causative stem from root kṣal.

Root: kṣal (class 1)

मलेन (malena) - by dirt, with impurity, by defilement

(noun)

Instrumental, neuter, singular of mala

mala - dirt, impurity, defilement, sin

एव (eva) - itself, indeed, only

(indeclinable)

मलं (malaṁ) - dirt, impurity, defilement

(noun)

Accusative, neuter, singular of mala

mala - dirt, impurity, defilement, sin

क्षालनकोविदाः (kṣālanakovidāḥ) - those skilled in cleansing/purification

(adjective)

Nominative, masculine, plural of kṣālanakovida

kṣālanakovida - skilled in washing, expert in purification

Compound type : tatpuruṣa (kṣālana+kovida)

• kṣālana – washing, cleansing, purification
  noun (neuter)
  verbal noun
  Derived from root kṣal with suffix -ana.
  Root: kṣal (class 1)
• kovida – skilled, expert, clever
  adjective (masculine)

Note: Used here as a noun referring to 'those skilled'.

वारयन्ति (vārayanti) - they repel, they ward off, they prevent

(verb)

3rd person , plural, active, present (laṭ) of vāraya

causative

Causative stem from root vṛ.

Root: vṛ (class 10)

अस्त्रम् (astram) - a weapon, a missile

(noun)

Accusative, neuter, singular of astra

astra - weapon, missile, projectile

Root: as (class 4)

अस्त्रेण (astreṇa) - with a weapon, by a missile

(noun)

Instrumental, neuter, singular of astra

astra - weapon, missile, projectile

Root: as (class 4)

विषम् (viṣam) - poison

(noun)

Accusative, neuter, singular of viṣa

viṣa - poison, venom, harmful substance

Root: viṣ (class 3)

प्रति (prati) - against, towards, in return for

(indeclinable)

विषेण (viṣeṇa) - with poison

(noun)

Instrumental, neuter, singular of viṣa

viṣa - poison, venom, harmful substance

Root: viṣ (class 3)

च (ca) - and, also

(indeclinable)