ŚVETĀŚVATARA UPANISHAD · 3.2

एको हि रुद्रो न द्वितीयाय तस्थे य इमांल् लोकान् ईशत ईशनीभिः ।
प्रत्यङ् जनास् तिष्ठति संचुकोचान्तकाले संसृज्य विश्वा भुवनानि गोपाः ॥

eko hi rudro na dvitīyāya tasthe ya imāṃl lokān īśata īśanībhiḥ ।
pratyaṅ janās tiṣṭhati saṃcukocāntakāle saṃsṛjya viśvā bhuvanāni gopāḥ ॥

For there is one Rudra only, they do not allow a second, who rules all the worlds by his powers. He stands behind all persons, and after having created all worlds he, the protector, rolls it up at the end of time.

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