महाभारतः mahābhārataḥ - book-3, chapter-81, verse-57

तत्र स्नात्वार्चयित्वा च दैवतानि पितॄंस्तथा ।
उषित्वा रजनीमेकामग्निष्टोमफलं लभेत् ॥५७॥

57. tatra snātvārcayitvā ca daivatāni pitṝṁstathā ,
uṣitvā rajanīmekāmagniṣṭomaphalaṁ labhet.

57. tatra snātvā arcayitvā ca daivatāni pitṝn tathā
uṣitvā rajanīm ekām agniṣṭomaphalam labhet

57. tatra snātvā ca daivatāni pitṝn tathā arcayitvā
ekām rajanīm uṣitvā agniṣṭomaphalam labhet

57. Having bathed there and worshipped the deities and ancestors, and having stayed for one night, one obtains the merit of an Agniṣṭoma (Vedic ritual).

Words meanings summery:

• तत्र (tatra) - at the specific sacred bathing place being discussed (there, in that place)

• स्नात्वा (snātvā) - having bathed

• अर्चयित्वा (arcayitvā) - having performed the ritual act of worshipping or honoring (having worshipped, having honored)

• च (ca) - and, also

• दैवतानि (daivatāni) - gods or goddesses, as a collective group, to whom worship is offered (deities, divine beings)

• पितॄन् (pitṝn) - deceased ancestors who are worshipped as a class of beings in śrāddha rituals (ancestors, fathers)

• तथा (tathā) - 'and similarly' or 'as well as', connecting the worship of deities and ancestors (thus, so, and, also)

• उषित्वा (uṣitvā) - having spent the night (at the sacred place) (having stayed, having resided)

• रजनीम् (rajanīm) - for the duration of a single night (night)

• एकाम् (ekām) - one, a single

• अग्निष्टोमफलम् (agniṣṭomaphalam) - the spiritual merit or reward obtained from performing an Agniṣṭoma Vedic ritual (yajña) (the fruit/result of the Agniṣṭoma)

• लभेत् (labhet) - one would obtain, one should obtain, one receives, he gains

Words meanings and morphology

तत्र (tatra) - at the specific sacred bathing place being discussed (there, in that place)

(indeclinable)

from tad (that) + tral (locative suffix)

स्नात्वा (snātvā) - having bathed

(indeclinable)

Root: snā (class 2)

Note: `snātvā` is an indeclinable past participle (absolutive/gerund).

अर्चयित्वा (arcayitvā) - having performed the ritual act of worshipping or honoring (having worshipped, having honored)

(indeclinable)

causative stem `arcaya` + `ktvā` suffix for absolutive

Root: arc (class 1)

Note: `arcayitvā` is an indeclinable past participle (absolutive/gerund) from the causative stem.

च (ca) - and, also

(indeclinable)

दैवतानि (daivatāni) - gods or goddesses, as a collective group, to whom worship is offered (deities, divine beings)

(noun)

Accusative, neuter, plural of daivata

daivata - divine beings, deities, relating to gods

derived from `deva` (god) + `aṇ` (suffix for 'related to' or 'group of')

Note: Object of `arcayitvā`.

पितॄन् (pitṝn) - deceased ancestors who are worshipped as a class of beings in śrāddha rituals (ancestors, fathers)

(noun)

Accusative, masculine, plural of pitṛ

pitṛ - father, ancestor, progenitor

Note: Object of `arcayitvā`.

तथा (tathā) - 'and similarly' or 'as well as', connecting the worship of deities and ancestors (thus, so, and, also)

(indeclinable)

उषित्वा (uṣitvā) - having spent the night (at the sacred place) (having stayed, having resided)

(indeclinable)

from root `vas` (to dwell), `ktvā` suffix for absolutive, with `u` augment

Root: vas (class 1)

Note: `uṣitvā` is an indeclinable past participle (absolutive/gerund).

रजनीम् (rajanīm) - for the duration of a single night (night)

(noun)

Accusative, feminine, singular of rajanī

rajanī - night

Root: raj

Note: Functions as an adverb of duration ('for a night').

एकाम् (ekām) - one, a single

(numeral)

Note: Modifies `rajanīm`.

अग्निष्टोमफलम् (agniṣṭomaphalam) - the spiritual merit or reward obtained from performing an Agniṣṭoma Vedic ritual (yajña) (the fruit/result of the Agniṣṭoma)

(noun)

Accusative, neuter, singular of agniṣṭomaphala

agniṣṭomaphala - fruit of Agniṣṭoma, result of Agniṣṭoma

from `agniṣṭoma` (name of a Vedic ritual) + `phala` (fruit, result)

Compound type : tatpuruṣa (agniṣṭoma+phala)

• agniṣṭoma – Agniṣṭoma (a principal Soma Vedic ritual)
  noun (masculine)
  lit. 'praise of Agni'
• phala – fruit, result, consequence, reward
  noun (neuter)
  Root: phal

Note: Object of `labhet`.

लभेत् (labhet) - one would obtain, one should obtain, one receives, he gains

(verb)

3rd person , singular, active, optative (vidhi-liṅ) of labh

Root: labh (class 1)

Note: Implies a beneficial outcome or a desired consequence of the actions.