Articles:
- Isaiah 6: A Window into Biblical Worship
- Orthodox Worship Versus “Contemporary Worship”
- On Earth as in Heaven: The Origins of Orthodox Worship
- Historical Origin of Orthodox Worship
Ancient sources:
We have a record of an explanation of Christian worship delivered to converts to Christianity that were about to be baptized, presented by a man named Cyril who was either the bishop or a presbyter of the Church of Jerusalem at the time. Think about it: this is a description of the details of the Christian service of worship recorded before the list of books comprising the New Testament was even finalized (this only took place in 367)…
Here is a link to this text: http://www.catecheticsonline.com/Catechetics_Cyril.php
A sampler of Orthodox hymns and sung prayers with the text (or biblical passage) shown
The Biblical/Jewish Origins of Christian Worship by an Orthodox priest of Jewish descent, Fr James Berstein