The below verses are chanted at the beginning of a teaching, in schools, before a puja for any auspicious event.
सर्वे भवन्तु सुखिनः।
सर्वे सन्तु निरामयाः।
सर्वे भद्राणि पश्यन्तु।
मा कश्चिद्दुःखभाग्भवेत्।
ॐ शान्तिः शान्तिः शान्तिः॥
Sarve bhavantu sukhinaḥ
Sarve santu nirāmayāḥ
Sarve bhadrāṇi paśyantu
Mā kaścid duḥkha bhāg bhavet
Om śāntiḥ śāntiḥ śāntiḥ
Sarve bhavantu sukhinaḥ — May all be happy
Sarve santu nirāmayāḥ — May all be free from illness
Sarve bhadrāṇi paśyantu — May all see what is auspicious
Mā kaścid duḥkha bhāg bhavet — May no one suffer in any way
Om Shantiḥ Shantiḥ Shantiḥ — Om, peace, peace, peace (invoking peace at the physical, mental, and spiritual levels)
These verses does not appear in the Vedas or major Upanishads verbatim.. It is a post-Vedic shloka, composed in the spirit of the Upanishads, and integrated into Hindu liturgical tradition. It is one of the prayers chanted before rituals from the Shanti Mantra collections.
असतो मा सद्गमय।
तमसो मा ज्योतिर्गमय।
मृत्योर् मा अमृतं गमय।
ॐ शान्तिः शान्तिः शान्तिः॥
Bṛhadāraṇyaka Upanishad (1.3.28)
Asato mā sad gamaya
Tamaso mā jyotir gamaya
Mṛtyor mā amṛtaṁ gamaya
Om śāntiḥ śāntiḥ śāntiḥ
Lead me from untruth to truth
From darkness to light
From death to immortality
Om, peace, peace, peace