↑In a step that was symbolically important in view of the council's prohibition of depicting Christ as a Lamb, Sergius introduced into the liturgy the chant "Lamb of God, you take away the sins of the world, have mercy on us" at the breaking of the Host during Mass, and restored the damaged facade mosaic in the atrium of Saint Peter's that depicted the Worship of the Lamb. Cfr. Ekonomou, 2007, p. 223. The Agnus Dei would have been chanted in both Greek and Latin during this period, in the same manner as the other liturgical changes of Sergius. Cfr. Ekonomou, 2007, p. 250.
Ekonomou, Andrew J. 2007. Byzantine Rome and the Greek Popes: Eastern influences on Rome and the papacy from Gregory the Great to Zacharias, A.D. 590–752. Lexington Books. ISBN 978-0739119778
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