Shanti Mantra

असतो मा सद्गमय
पूर्णमदः पूर्णमिदम्
सह नाववतु
सर्वे भवन्तु सुखिनः
सर्वेषां स्वस्तिर्भवतु

असतो मा सद्गमय

ॐ असतो मा सद्गमय ।
तमसो मा ज्योतिर्गमय ।
मृत्योर्मा अमृतं गमय ।
ॐ शान्तिः शान्तिः शान्तिः ॥

Oṃ asato mā sadgamaya |
Tamaso mā jyotirgamaya |
Mṛtyor mā amṛtaṃ gamaya |
Oṃ śāntiḥ śāntiḥ śāntiḥ ||

Source

This mantra is found in:

बृहदारण्यकोपनिषद् (Bṛhadāraṇyaka Upaniṣad), 1.3.28
शुक्लयजुर्वेदः (Śukla Yajurveda)

It is traditionally known as the पवमान मन्त्र (Pavamāna Mantra).

Meaning

असतो मा सद्गमय — Lead me from untruth to truth.
तमसो मा ज्योतिर्गमय — Lead me from darkness to light.
मृत्योर्मा अमृतं गमय — Lead me from death to immortality.

This is a prayer for spiritual enlightenment, seeking guidance from ignorance to knowledge and from mortality to immortality.

पूर्णमदः पूर्णमिदम्

ॐ पूर्णमदः पूर्णमिदं पूर्णात् पूर्णमुदच्यते ।
पूर्णस्य पूर्णमादाय पूर्णमेवावशिष्यते ॥
ॐ शान्तिः शान्तिः शान्तिः ॥

Oṃ pūrṇamadaḥ pūrṇamidaṃ pūrṇāt pūrṇamudacyate |
Pūrṇasya pūrṇamādāya pūrṇamevāvaśiṣyate ||
Oṃ śāntiḥ śāntiḥ śāntiḥ ||

Source

This mantra is traditionally recited as the Śānti Pāṭha (peace invocation) of:

ईशोपनिषत् (Īśā Upaniṣad), शुक्लयजुर्वेदः (Śukla Yajurveda)
बृहदारण्यकोपनिषद् (Bṛhadāraṇyaka Upaniṣad), 5.1.1, शुक्लयजुर्वेदः (Śukla Yajurveda)

Meaning

पूर्णमदः — That is whole (complete or infinite).
पूर्णमिदम् — This is whole (complete or infinite).
पूर्णात् पूर्णमुदच्यते — From the whole, the whole arises.
पूर्णस्य पूर्णमादाय — When the whole is taken from the whole.
पूर्णमेवावशिष्यते — The whole alone remains.

The mantra expresses the completeness and infinite nature of Brahman. Even when the universe emerges from the infinite reality, that infinite reality remains complete.

सह नाववतु

ॐ सह नाववतु ।
सह नौ भुनक्तु ।
सह वीर्यं करवावहै ।
तेजस्वि नावधीतमस्तु मा विद्विषावहै ।
ॐ शान्तिः शान्तिः शान्तिः ॥

Oṃ saha nāvavatu |
Saha nau bhunaktu |
Saha vīryaṃ karavāvahai |
Tejasvi nāvadhītamastu mā vidviṣāvahai |
Oṃ śāntiḥ śāntiḥ śāntiḥ ||

Source

This mantra is found as a Śānti Pāṭha in:

तैत्तिरीयोपनिषद् (Taittirīya Upaniṣad), कृष्णयजुर्वेदः (Kṛṣṇa Yajurveda)
कठोपनिषद् (Kaṭha Upaniṣad), कृष्णयजुर्वेदः (Kṛṣṇa Yajurveda)

Meaning

सह नाववतु — May He protect us both.
सह नौ भुनक्तु — May He nourish us both.
सह वीर्यं करवावहै — May we work together with strength and vigour.
तेजस्वि नावधीतमस्तु — May our study be illuminating and fruitful.
मा विद्विषावहै — May we not hate one another.

This mantra is traditionally recited by teachers and students before beginning their studies. It expresses the importance of mutual protection, cooperation, knowledge and harmony between the teacher and the student.

सर्वे भवन्तु सुखिनः

ॐ सर्वे भवन्तु सुखिनः ।
सर्वे सन्तु निरामयाः ।
सर्वे भद्राणि पश्यन्तु ।
मा कश्चिद्दुःखभाग्भवेत् ।
ॐ शान्तिः शान्तिः शान्तिः ॥

Oṃ sarve bhavantu sukhinaḥ |
Sarve santu nirāmayāḥ |
Sarve bhadrāṇi paśyantu |
Mā kaścid duḥkhabhāg bhavet |
Oṃ śāntiḥ śāntiḥ śāntiḥ ||

Source

This is a traditional Sanskrit prayer for universal well-being.

It is widely recited in Hindu devotional and spiritual traditions.
Its precise original textual source is not firmly established.
It is commonly recited as a universal prayer for the welfare of all beings.

Meaning

सर्वे भवन्तु सुखिनः — May all be happy.
सर्वे सन्तु निरामयाः — May all be free from illness.
सर्वे भद्राणि पश्यन्तु — May all see what is auspicious.
मा कश्चिद्दुःखभाग्भवेत् — May no one suffer or experience sorrow.

This prayer expresses the universal wish for happiness, good health, prosperity and freedom from suffering for all living beings, without distinction.

सर्वेषां स्वस्तिर्भवतु

ॐ सर्वेषां स्वस्तिर्भवतु ।
सर्वेषां शान्तिर्भवतु ।
सर्वेषां पूर्णं भवतु ।
सर्वेषां मङ्गलं भवतु ।
ॐ शान्तिः शान्तिः शान्तिः ॥

Oṃ sarveṣāṃ svastir bhavatu |
Sarveṣāṃ śāntir bhavatu |
Sarveṣāṃ pūrṇaṃ bhavatu |
Sarveṣāṃ maṅgalaṃ bhavatu |
Oṃ śāntiḥ śāntiḥ śāntiḥ ||

Source

This is a traditional Sanskrit prayer for universal welfare (सर्वजनकल्याण प्रार्थना).

It is widely used in Hindu prayers, spiritual gatherings and devotional traditions.
A definitive original Vedic or Upaniṣadic textual reference is not firmly established.

Meaning

सर्वेषां स्वस्तिर्भवतु — May there be well-being for all.
सर्वेषां शान्तिर्भवतु — May there be peace for all.
सर्वेषां पूर्णं भवतु — May there be completeness and fulfilment for all.
सर्वेषां मङ्गलं भवतु — May there be auspiciousness for all.

This mantra expresses the wish for universal well-being, peace, fulfilment and auspiciousness.

It reminds us that peace and prosperity should extend to everyone, not merely to oneself or one's immediate community.