BṚHADĀRAṆYAKA UPANISHAD · 3.9.4

कतमे रुद्रा इति ।
दशेमे पुरुषे प्राणा आत्मैकादशः ।
ते यदास्माच् छरीरान् मर्त्याद् उत्क्रामन्त्य् अथ रोदयन्ति ।
तद् यद् रोदयन्ति तस्माद् रुद्रा इति ॥

katame rudrā iti ।
daśeme puruṣe prāṇā ātmaikādaśaḥ ।
te yadāsmāc charīrān martyād utkrāmanty atha rodayanti ।
tad yad rodayanti tasmād rudrā iti ॥

He asked: 'Who are the Rudras?' Yâgñavalkya replied: 'These ten vital breaths (prânas, the senses, i.e. the five gñânendriyas, and the five karmendriyas), and Âtman, as the eleventh. When they depart from this mortal body, they make us cry (rodayanti), and because they make us cry, they are called Rudras.'

F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)