This is a Shati (peace) Mantra called "Pavamana Mantra". The Pavamana Mantra (pavamāna meaning "being purified, strained", historically a name of Soma), also known as pavamāna abhyāroha (abhyāroha, lit. "ascending", being an Upanishadic technical term for "prayer") is a Hindu mantra introduced in the Bṛhadāraṇyaka Upaniṣad (1.3.28) asato mā sad gamaya, tamaso mā jyotir gamaya, mṛtyor mā amṛtaṃ gamaya Lead me from falsehood to truth, Lead me from darkness to light, Lead me from death to the immortality