Valmiki Ramayana Aranya Kanda Sarga 74 Shloka 22
Original Shlokaइह ते भावितात्मानो गुरवो मे महावने। जुहवाञ्चक्रिरे तीर्थं मन्त्रवन्मन्त्रपूजितम्।।3.74.22।।
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महावने in this great garden, भावितात्मानः who perceived the supreme spirit, ते they, मे गुरुवः my preceptors, इह here, मन्त्रवत् by the power of mantras, मन्त्रपूजितम् invoked by mantras, तीर्थम् waters, जुहवाञ्चक्रिरे performed sacrifice.
My precepters, who had perceived the Supreme Spirit made sacrificial offerings in this great garden, invoked gods through the power of mantras. They brought water and offered oblations to the sacrificial fire.