Shiva Purana
भवंतो मा भविष्यंतु शिवैक परदैवताः॥ अन्यदेवसमत्वेन जानंतु शिवमद्वयम् ॥ ३९॥
You will not have Śiva as your sole deity. You will be considering the matchless Śiva on a par with other gods.
english translation
bhavaMto mA bhaviSyaMtu zivaika paradaivatAH॥ anyadevasamatvena jAnaMtu zivamadvayam ॥ 39॥
hk transliteration by Sanscript