Shiva Purana
भवद्भिश्च तथा कार्यं यथा स्वास्थ्यं भवेदिह ॥ शिवलिंगस्य ऋषयो मनसा संविचार्य्यताम् ॥ २९ ॥
O sages, you must do such things as will make the penis of Śiva steady. Please ponder over this in your minds.
english translation
bhavadbhizca tathA kAryaM yathA svAsthyaM bhavediha ॥ zivaliMgasya RSayo manasA saMvicAryyatAm ॥ 29 ॥
hk transliteration by Sanscript