Within the past few decades, a new form of worship has become widely popular among Christians. Where before people would sing hymns accompanied by an organ, then listen to a sermon, in this new worship there are praise bands that use rock band instruments, short, catchy praise songs, sophisticated Powerpoint presentations, and the pastor giving uplifting practical teachings about having a fulfilling life as a Christian. This new kind of worship is so popular that people come to these services by the thousands. They go because the services are fun, exciting, easy to understand, and easy to relate to. Yet this new style of worship is light years away from the more traditional and liturgical Orthodox style of worship.
Our forefathers had the tabernacle of the Testimony with them in the desert. It had been made as God directed Moses, according to the pattern he had seen. (Acts 7:44 NIV, bolds added).
This phrase comes up again in the book of Hebrews.
They serve at a sanctuary that is a copy and shadow of what is in heaven. This is why Moses was warned when he was about to build the tabernacle: "See to it that you make everything according to the pattern shown you on the mountain." (Hebrews 8:5 NIV, bold added)
The phrase is a reference to Exodus 24:15-18 when Moses went up on Mt. Sinai and spent forty days and forty nights up there. On Mt. Sinai Moses was in the direct presence of God receiving instructions about how to order the life of the new Jewish nation. Thus, the guiding principle for Old Testament worship was not creative improvisation nor adapting to contemporary culture but imitation of the heavenly prototype.