Shiva Purana
पूजां कृत्वा यथान्यायं क्रियावैकल्यशुद्धये ॥ वाचकेनैव मंत्रेण जुहुयादाहुतित्रयम् ॥ ४२ ॥
After performing worship in accordance with the prescribed rituals, one should purify oneself of the differences in activities. One should offer three oblations with the same mantra recited by the reciter.
english translation
pUjAM kRtvA yathAnyAyaM kriyAvaikalyazuddhaye ॥ vAcakenaiva maMtreNa juhuyAdAhutitrayam ॥ 42 ॥
hk transliteration by Sanscript