Asato Ma Sadgamaya

ॐ असतो मा सद्गमय तमसो मा ज्योतिर्गमय मृत्योर्मा अमृतं गमय
Oṃ Asato Mā Sadgamaya Tamaso Mā Jyotirgamaya Mṛtyor Mā Amṛtaṃ Gamaya

Source: Brihadaranyaka Upanishad 1.3.28 (the opening Om is added in recitation)