Om Asatoma Sad Gamaya (Vedic)

Full Form:

Om _asato mā s_ad gamáya |
Om t_amaso mā jy_otir gamáya |
Om mr_ityorma amr_itam gamáya ||
Om shant_i, shant_i, shantíḥ

Usage:

Lead from darkness into light, from unreality into reality, from death to immortality.

Meaning:

Lead us from unreality to reality.
From darkness to light.
From death to immortality.
Om peace, peace, peace.

Vedic Shanti Mantra from the Yajur Veda: Brihadaranyaka Upanishads (1.3.28).