Chāndogya Upaniṣad 2.10.6

2.10.6

āpnotīhādityasya jayam \
paro hāsyādityajayāj jayo bhavati ya etad evaṃ vidvān ātmasaṃmitam atimṛtyu saptavidhaṃ sāmopāste sāmopāste \\210.6\

6. He obtains the victory of the sun, indeed, a victory higher than the victory of the sun is his, who, knowing this thus, reverences the sevenfold Sāman, measured in itself, as leading beyond death—yea, who reverences the Sāman!