Shiva Purana
पित्रा नियमिताः पूर्वं त्रयोपि त्रिषु कर्मसु ॥ ब्रह्मा सर्गे हरिस्त्राणे रुद्रः संहरणे तथा ॥ १५ ॥
In the past, all three of them were regulated by their father in all three activities. Brahma in creation and Hari in protection and Rudra in destruction.
english translation
pitrA niyamitAH pUrvaM trayopi triSu karmasu ॥ brahmA sarge haristrANe rudraH saMharaNe tathA ॥ 15 ॥
hk transliteration by Sanscript