Shiva Purana
हस्तेष्वाचमनीयं च मौलिष्वर्घ्यं प्रदापयेत्॥ शंखोद बिन्दुभिस्तासां स्नानकर्म च भावयेत्॥ १७ ॥
The water for Ācamana shall be offered in their hands and Arghya on their heads. He shall conceive of their ritualistic ablution with the drops of water from the conch.
english translation
hasteSvAcamanIyaM ca mauliSvarghyaM pradApayet॥ zaMkhoda bindubhistAsAM snAnakarma ca bhAvayet॥ 17 ॥
hk transliteration by Sanscript