वाल्मीकि-रामायणम् vālmīki-rāmāyaṇam - book-6, chapter-10, verse-20

आत्मानं सर्वथा रक्ष पुरीं चेमां सराक्षसाम् ।
स्वस्ति ते ऽस्तु गमिष्यामि सुखी भव मया विना ॥२०॥

20. ātmānaṃ sarvathā rakṣa purīṃ cemāṃ sarākṣasām ,
svasti te'stu gamiṣyāmi sukhī bhava mayā vinā.

20. ātmānam sarvathā rakṣa purīm ca imām sarākṣasām
svasti te astu gamiṣyāmi sukhī bhava mayā vinā

20. tvam ātmānam sarvathā rakṣa imām purīm ca sarākṣasām
te svasti astu mayā vinā sukhī bhava gamiṣyāmi

20. Protect your being (ātman) completely, and this city along with its rākṣasas. May good fortune be with you. I will go; be happy without me.

Words meanings summery:

• आत्मानम् (ātmānam) - your own being (self, soul, spirit, being)

• सर्वथा (sarvathā) - completely (in every way, by all means, completely)

• रक्ष (rakṣa) - protect (protect, guard)

• पुरीम् (purīm) - this city (city, town)

• च (ca) - and (and, also)

• इमाम् (imām) - this (this (feminine))

• सराक्षसाम् (sarākṣasām) - along with its rākṣasas (with rākṣasas, accompanied by rākṣasas)

• स्वस्ति (svasti) - good fortune (well-being, welfare, good fortune)

• ते (te) - to you (to you, for you (dative/genitive of tvam))

• अस्तु (astu) - let it be (let it be, may it be)

• गमिष्यामि (gamiṣyāmi) - I will go

• सुखी (sukhī) - happy (happy, comfortable, joyful)

• भव (bhava) - be (be, become)

• मया (mayā) - by me, from me (by me, with me)

• विना (vinā) - without

Words meanings and morphology

आत्मानम् (ātmānam) - your own being (self, soul, spirit, being)

(noun)

Accusative, masculine, singular of ātman

ātman - self, soul, spirit, essence, being

सर्वथा (sarvathā) - completely (in every way, by all means, completely)

(indeclinable)

tās-suffix (sarva + thā)

रक्ष (rakṣa) - protect (protect, guard)

(verb)

2nd person , singular, active, imperative (loṭ) of rakṣ

Imperative mood, 2nd person singular

Root: rakṣ (class 1)

पुरीम् (purīm) - this city (city, town)

(noun)

Accusative, feminine, singular of purī

purī - city, town, fort

च (ca) - and (and, also)

(indeclinable)

इमाम् (imām) - this (this (feminine))

(pronoun)

Accusative, feminine, singular of idam

idam - this

सराक्षसाम् (sarākṣasām) - along with its rākṣasas (with rākṣasas, accompanied by rākṣasas)

(adjective)

Accusative, feminine, singular of sarākṣasa

sarākṣasa - with rākṣasas

Compound type : bahuvrihi (sa+rākṣasa)

• sa – with, together with
  indeclinable
• rākṣasa – demon, rākṣasa
  noun (masculine)

Note: Agrees with 'purīm'

स्वस्ति (svasti) - good fortune (well-being, welfare, good fortune)

(noun)

Nominative, feminine, singular of svasti

svasti - well-being, welfare, good fortune, benediction

ते (te) - to you (to you, for you (dative/genitive of tvam))

(pronoun)

Dative, singular of tvam

tvam - you (singular)

Note: Also used as genitive, but dative fits here 'may good fortune be to you'.

अस्तु (astu) - let it be (let it be, may it be)

(verb)

3rd person , singular, active, imperative (loṭ) of as

Imperative mood, 3rd person singular

Root: as (class 2)

गमिष्यामि (gamiṣyāmi) - I will go

(verb)

1st person , singular, active, future (lṛṭ) of gam

Future tense, 1st person singular

Root: gam (class 1)

सुखी (sukhī) - happy (happy, comfortable, joyful)

(adjective)

Nominative, masculine, singular of sukhin

sukhin - happy, comfortable, joyful

Note: Vocative sense is also possible, 'O happy one', but 'be happy' is more direct imperative.

भव (bhava) - be (be, become)

(verb)

2nd person , singular, active, imperative (loṭ) of bhū

Imperative mood, 2nd person singular

Root: bhū (class 1)

मया (mayā) - by me, from me (by me, with me)

(pronoun)

Instrumental, singular of asmad

asmad - I, we

विना (vinā) - without

(indeclinable)

Note: Governs instrumental case (mayā).