Shiva Purana
आपूर्य शुद्धतोयेन प्रणवेन सुगंधिना॥ अभ्यर्च्य गंधपुष्पाद्यैः प्रणवेन च सप्तधा ॥ ६ ॥
Fill it with pure water and fragrant oṁkāra. After worshiping him with fragrant flowers and other offerings and chanting the oṁkāra in seven parts.
english translation
ApUrya zuddhatoyena praNavena sugaMdhinA॥ abhyarcya gaMdhapuSpAdyaiH praNavena ca saptadhA ॥ 6 ॥
hk transliteration by Sanscript