In this video we see the words of St. Justin wrote to the Roman emperor in 155 AD to defend Christianity. He describes a Mass which would be familiar to us today – the reading from scripture, the homily, the petitions, the offertory, the praying over the gifts, the reception of communion. He even describes bringing communion to those who are not present. He explains that this is called Eucharist and that we believe it is truly the body and blood of Christ.
This is a wonderful resource to show the continuity of the order of Mass throughout the ages.