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Canon XVII.
Canons of Local Councils Received Ecumenically (Ancyra, Gangra, Neocaesarea, Antioch, Laodicea) · The Seven Holy Ecumenical Councils
The Psalms are not to be joined together in the congregations, but a lesson shall intervene after every psalm.
LocalE 5.20.2
It was well to separate the Psalms by lessons when the congregation was gathered in church, and not to keep them continuously singing unbroken psalmody, lest those who had assembled might become careless through weariness.
LocalE 5.20.7
This was an ancient custom which has been laid aside since the new order of ecclesiastical matters has been instituted.
LocalE 5.20.9