Shanti Mantra 1

Meaning:

Oṁ saha nāvavatu . Saha nau bhunaktu . Saha vīryaṁ karavāvahai . Tejasvināvadhītamastu mā vidviṣāvahai.

Oṁ śantiḥ śantiḥ śantiḥ ..1..

May both of us be protected. May both of us enjoy together. May we both perform heroic deeds. May we become brilliant. May we never hate each other. Om peace, peace, peace.

Oṁ gaṇānāṁ tvā gaṇapatim̐̐ havāmahe kavim kavīnāmupamaśravastamam . 

Jyeṣṭharājaṁ brahmaṇāṁ brahmaṇaspata ā  naḥ śṛṇvannūtibhissīdasādanam. 

Oṁ mahāgaṇapataye namaḥ ..2..

O the leader of the ganas, who is learned and the foremost among the learned, who is  the eldest of the elders, who is  Brahman, and the embodiment of Brahman; we offer our oblations unto you. Please come to us by Listening to our Prayers and be Present in the Seat of this Sacred Sacrificial Altar. Om salutation to the great Ganapati.

Oṁ śaṁ no mitraḥ śaṁ varuṇaḥ . Śaṁ no bhavatvaryamā . Śaṁ na indro brihaspatiḥ . Śaṁ no viṣṇururukramaḥ . Namo brahmaṇe . Namaste vāyo . Tvameva pratyakṣaṃ bhrahmāsi . Tvāmeva pratyakṣam brahma vadiṣyāmi . Ṛtaṃ vadiṣyāmi . Satyaṃ vadiṣyāmi . Tanmāmavatu . Tadvaktāramavatu . Avatu mām . Avatu vaktāram .

Oṁ śantiḥ śantiḥ śantiḥ ..3..

May Mitra and Varuna be auspicious to us. May Aryama be auspicious  to us. May Indra and Brihaspati be auspicious to us. May Vishnu who took long steps be auspicious to us.  Salutation to Brahman. Salutation to you, O wind! You are the visible Brahman. I shall declare you alone as the visible Brahman. I shall speak right. I shall speak truth. May he protect me. May he protect the speaker. May he protect me. May he protect the speaker. Om, peace, peace, peace.

Oṁ pūrṇamadaḥ pūrṇamidam pūrṇāt pūrṇamudacyate .

Pūrṇasya pūrṇamādāya pūrṇamevāvaśiṣyate . 

Oṁ śāntiḥ śāntiḥ śāntiḥ ..4..

That is infinite, and this is infinite. This infinite emerges from that infinite. After taking this infinitude out of that infinite, that still remains as infinite. Om, peace, peace, peace.

Notes:

• The first Shanti Mantra is the opening hymn of chapter 10. The speakers wish that they enjoy and grow together. 
• The next Mantra is addressed to Ganesha and is found in Rigveda Mandala 2 Chapter 23 Verse 1.
• The second Shanti Mantra is the opening hymn of chapter 7. The speaker says that he will speak the truth. He requests that truth to protect him.
• The last Shanti Mantra is the invocation of Ishavasya Upanishad i.e. Chapter 40 of the Vajasaneyi Samhita of Shukla Yajurveda. This Mantra explains the nature of the Prakriti(universe)-referred to as "this"-and Purusha(conciousness)-referred to as "that". It is mostly used as a concluding Shanti Mantra.