Shiva Purana
शैवैर्माहेश्वरैश्चैव कार्यमंतर्बहिः क्रमात् ॥ शिवो महेश्वरश्चेति नात्यंतमिह भिद्यते ॥ ८ ॥
The Śivas and Maheśvaras should perform the rituals inside and outside one after another. There is no difference between Shiva and Maheshwara in this world.
english translation
zaivairmAhezvaraizcaiva kAryamaMtarbahiH kramAt ॥ zivo mahezvarazceti nAtyaMtamiha bhidyate ॥ 8 ॥
hk transliteration by Sanscript