Valmiki Ramayana Bala Kanda Sarga 60 Shloka 9

मन्त्रकोविदा: proficient in sacred prayers, ऋत्विजश्च officiating priests, मन्त्रवत् in accordance with mantras, यथाकल्पम् according to prescribed kalpa, यथाविधि according to rules and tradition, सर्वाणि all, कर्माणि rites, आनुपूर्व्येण in accordance with their respective ranks, चक्रु: performed.

The officiating priests proficient in chanting mantras performed in order of their respective ranks all the rites in accordance with the Yojanakalpa adhering to codes and traditions.