Shiva Purana
शिवपूजापरो मौनी सत्यादिगुणसंयुतः । क्रियातपोजपज्ञानध्यानेष्वेकैकमाचरेत् 1-18-१५० ।
A person observing worship of Śiva shall observe silence and perform one of these—a sacred rite, penance, Japa, maintenance of the knowledge or meditation. He shall observe truthfulness etc.
english translation
zivapUjAparo maunI satyAdiguNasaMyutaH । kriyAtapojapajJAnadhyAneSvekaikamAcaret 1-18-150 ।
hk transliteration by Sanscript