Shanti Mantra

 A Shanti mantra is a prayer or chant for peace, often recited before and after Hindu religious rituals or ceremonies. The word 'Shanti' comes from Sanskrit which means peace and the word 'mantra' means prayer or song of praise, often recited repeatedly. Shanti mantra is chanted to calm the mind of the reciter and the nature around her/him. Traditionally, a Shanti mantra ends with three recitations of "Shanti", which is believed to remove obstacles and calm the three reals: Physical, Divine, and Internal.

om saha nāv avatu

saha nau bhunaktu

saha vīryaṃ karavāvahai

tejasvi nāv adhītam astu

mā vidviṣāvahai |

Om śāntiḥ śāntiḥ śāntiḥ ||

Meaning

Om! May God protect us both together; may God nourish us both together;
May we work conjointly with great energy,
May our study be vigorous and effective;
May we not mutually dispute (or may we not hate any).
Om! Let there be peace in me!
Let there be peace in my environment!
Let there be peace in the forces that act on me!

Shanti mantra helps us to attain peace and be calm and rejuvenates our body and regular practice will definitely prove very much helpful. 

we ask for protection and for nourishment from god and we need to work together with great energy and practice things vigorously and should not hate each other because Through our work together, we will gain a better understanding of ourselves and what we study together. when we work as a team then only we can succeed, and we should always stay peaceful  and keep our environment peaceful