Avatarika
एतानि तानि यजूंषि— 'असतो मा सद्गमय' 'तमसो मा ज्योतिर्गमय' 'मृत्योर्मामृतं गमय' इति ।मन्त्राणामर्थस्तिरोहितो भवतीति स्वयमेव व्याचष्टे ब्राह्मणं मन्त्रार्थम्—
In plain words
These are those yajus formulas: 'From the unreal, lead me to the real. From darkness, lead me to light. From death, lead me to immortality.' Because the meaning of these mantras is hidden, the Brahmana text itself explains their true import.
Close to the Sanskrit
These are those yajus formulas: 'From the unreal lead me to the real, from darkness lead me to light, from death lead me to immortality.' Since the meaning of the mantras is concealed, the Brahmana itself thoroughly explains the meaning of the mantra.