1. The worship of the early Church
"And on the day called Sunday, all who live in cities or in the country gather together to one place, and the memoirs of the apostles or the writings of the prophets are read, as long as time permits; then, when the reader has ceased, the president verbally instructs, and exhorts to the imitation of these good things. Then we all rise together and pray, and, as we before said, when our prayer is ended, bread and wine and water are brought, and the president in like manner offers prayers and thanksgivings, according to his ability, and the people assent, saying Amen; and there is a distribution to each, and a participation of that over which thanks have been given, and to those who are absent a portion is sent by the deacons."
--Justin Martyr, I Apol. 67 (A.D. 150-155)
2. What many today call Christian worship. . .
By the way, there's a little joke in here. The Hebrew tattoo deliberately incorrectly spells God's name. Instead of God's name (יהוה ), it says, ויהי , translated, "And it came to pass" or "And it was so." Of course the joke here is that people who get Hebrew tattoos really do not know how to read Hebrew at all.
H/T Bob Cargill