KAṬHA UPANISHAD · 1.1.5

बहूनामेमि प्रथमो बहूनामेमि मध्यमः ।
किँ स्विद्यमस्य कर्तव्यं यन्मयाऽद्य करिष्यति ॥ ५॥

bahūnāmemi prathamo bahūnāmemi madhyamaḥ ।
kim̐ svidyamasya kartavyaṃ yanmayā’dya kariṣyati ॥ 5॥

“Among many I walk the first, among many I walk the midmost; something Death means to do which today by me he will accomplish.