Om Poornamadah Poornamidam Poornaat "ॐ पूर्णमदः पूर्णमिदं पूर्णात्पूर्ण मुदच्यते।This Shanti Mantra appears in Ishopanishad. Its Sanskrit text, Hindi Meaning and English meaning is given below -
" Om Poornamadah Poornamidam Pooraatpoornamudachate.
Poornasya Poornamaadaay Poornamevaavashishyate.
Om Peace, Peace, Peace."
शान्ति पाठ -
"ॐ पूर्णमदः पूर्णमिदं पूर्णात्पूर्ण मुदच्यते।
पूर्णस्य पूर्णमादाय पूर्ण मेवा वशिष्यते।
ॐ शान्तिः शान्तिः शान्तिः। "
Meaning in English - He (Par Brahma ) is whole or complete (in all respects). This (creation or universe) is also whole or complete because it has come out from that whole ( Par Brahma). Even if whole or completeness is taken away from that whole, there remains only the whole.