महाभारतः mahābhārataḥ - book-12, chapter-63, verse-20

अर्चयित्वा पितॄन्सम्यक्पितृयज्ञैर्यथाविधि ।
देवान्यज्ञैरृषीन्वेदैरर्चित्वा चैव यत्नतः ॥२०॥

20. arcayitvā pitṝnsamyakpitṛyajñairyathāvidhi ,
devānyajñairṛṣīnvedairarcitvā caiva yatnataḥ.

20. arcayitvā pitṝn samyak pitṛ-yajñaiḥ yathāvidhi
devān yajñaiḥ ṛṣīn vedaiḥ arcayitvā ca eva yatnataḥ

20. pitṝn samyak yathāvidhi pitṛ-yajñaiḥ arcayitvā
devān yajñaiḥ ṛṣīn vedaiḥ ca eva yatnataḥ arcayitvā

20. having properly worshipped the ancestors with ancestral rites (pitṛyajñas), and having diligently worshipped the gods with sacrifices (yajñas) and the sages with (recitations of) the Vedas...

Words meanings summery:

• अर्चयित्वा (arcayitvā) - having worshipped (having worshipped, having honored)

• पितॄन् (pitṝn) - ancestors (ancestors, fathers)

• सम्यक् (samyak) - properly, duly (properly, completely, rightly, fully)

• पितृ-यज्ञैः (pitṛ-yajñaiḥ) - with ancestral rites (pitṛyajñas) (with ancestral sacrifices (pitṛyajñas))

• यथाविधि (yathāvidhi) - according to rule (according to rule, according to rite, properly)

• देवान् (devān) - gods (gods, deities)

• यज्ञैः (yajñaiḥ) - with sacrifices (yajñas) (with sacrifices (yajñas), with worship)

• ऋषीन् (ṛṣīn) - sages (sages, seers)

• वेदैः (vedaiḥ) - with (recitations of) the Vedas (with the Vedas, with sacred knowledge)

• अर्चयित्वा (arcayitvā) - having worshipped (having worshipped, having honored)

• च (ca) - and (and, also)

• एव (eva) - diligently, certainly (indeed, only, just, also)

• यत्नतः (yatnataḥ) - diligently (with effort, carefully, diligently)

Words meanings and morphology

अर्चयित्वा (arcayitvā) - having worshipped (having worshipped, having honored)

(indeclinable)

Absolutive / Gerund

Derived from the causal stem of the root 'arc' (to worship) with suffix '-itvā'.

Root: arc (class 1)

पितॄन् (pitṝn) - ancestors (ancestors, fathers)

(noun)

Accusative, masculine, plural of pitṛ

pitṛ - father, ancestor, forefathers

Note: Object of 'arcayitvā'.

सम्यक् (samyak) - properly, duly (properly, completely, rightly, fully)

(indeclinable)

From 'sam-añc' (to go together, to be united).

Root: añc (class 5)

पितृ-यज्ञैः (pitṛ-yajñaiḥ) - with ancestral rites (pitṛyajñas) (with ancestral sacrifices (pitṛyajñas))

(noun)

Instrumental, masculine, plural of pitṛ-yajña

pitṛ-yajña - ancestral sacrifice, oblation to ancestors (pitṛyajña)

Tatpurusha compound: 'pitṛ' (ancestor) + 'yajña' (sacrifice).

Compound type : Tatpurusha (pitṛ+yajña)

• pitṛ – father, ancestor
  noun (masculine)
• yajña – sacrifice, ritual, worship
  noun (masculine)
  Root: yaj (class 1)

Note: Indicates the means of worship.

यथाविधि (yathāvidhi) - according to rule (according to rule, according to rite, properly)

(indeclinable)

Avyayībhāva compound.

Compound type : Avyayībhāva (yathā+vidhi)

• yathā – as, according to
  indeclinable
• vidhi – rule, rite, ordinance, method
  noun (masculine)
  Root: dhā (class 3)

देवान् (devān) - gods (gods, deities)

(noun)

Accusative, masculine, plural of deva

deva - god, deity, divine

Root: div (class 1)

Note: Object of 'arcayitvā'.

यज्ञैः (yajñaiḥ) - with sacrifices (yajñas) (with sacrifices (yajñas), with worship)

(noun)

Instrumental, masculine, plural of yajña

yajña - sacrifice, ritual, worship (yajña)

Derived from root 'yaj' (to sacrifice, worship).

Root: yaj (class 1)

Note: Means of worshipping the gods.

ऋषीन् (ṛṣīn) - sages (sages, seers)

(noun)

Accusative, masculine, plural of ṛṣi

ṛṣi - sage, seer, inspired poet

Root: ṛṣ

Note: Object of 'arcayitvā' (implied with the second 'arcayitvā').

वेदैः (vedaiḥ) - with (recitations of) the Vedas (with the Vedas, with sacred knowledge)

(noun)

Instrumental, masculine, plural of veda

veda - Veda, sacred knowledge, scripture

Derived from root 'vid' (to know).

Root: vid (class 2)

Note: Means of worshipping the sages.

अर्चयित्वा (arcayitvā) - having worshipped (having worshipped, having honored)

(indeclinable)

Absolutive / Gerund

Derived from the causal stem of the root 'arc' (to worship) with suffix '-itvā'.

Root: arc (class 1)

च (ca) - and (and, also)

(indeclinable)

Note: Connects elements of the list of revered entities.

एव (eva) - diligently, certainly (indeed, only, just, also)

(indeclinable)

यत्नतः (yatnataḥ) - diligently (with effort, carefully, diligently)

(indeclinable)

Taddhita suffix '-tas' from 'yatna' (effort).

Root: yam (class 1)