The Lord’s Prayer is the model that Jesus Christ gave to his disciples. It is mentioned in the Gospel of Matthew 6:9-13 and in the Gospel of Luke 11:2-4, but in a different context. This prayer has been used in the liturgy since the early days of Christianity.
The book of the Didache includes this prayer with the final doxology, “Through our Lord Jesus Christ, for . . .” In the third century, Origen, in his book on Prayer, gave a detailed interpretation of this prayer.
St. Cyprian and Tertullian wrote detailed interpretations on this prayer. In the Coptic liturgy, there is not a single rite where this prayer is not recited at the commencement and conclusion of service.