“He slaughtered the ox and the ram as the fellowship offering for the people. His sons handed him the blood, and he sprinkled it against the altar on all sides. But the fat portions of the ox and the ram ~ the fat tail, the layer of fat, the kidneys and the covering of the liver ~ these they laid on the breasts, and then Aaron burned the fat on the altar. Aaron waved the breasts and the right thigh before the Lord as a wave offering, as Moses commanded.”
The Law of Moses did not have just Ten Commandments. It had over 600! They were intricate commands that had to be kept exactly. The above is just a small portion of what they were supposed to do for a particular sacrifice. (Yes, both tithes and offerings were required.)
Thank God, Jesus nailed the Old Law of Moses to the cross (Colossians 2:14). Yet some religious leaders continue to dip back into the Old Law to copy showy types of worship ~ robes, candles, choirs, harps, incense ~ many things, and all commanded. But if they do that, they must keep all of the Law of Moses. They can’t just pick and choose which ones they like. The Apostle Paul said in Galatians 5:17 “Again I declare to every man who lets himself be circumcised [just one command in the Old Law of Moses] that he is obligated to obey the whole law.”
Old Testament worship was showy and elaborate. New Testament worship is just the opposite.
Mark 14:26 says that after Jesus instituted the Lord’s Supper/Communion, “When they had sung a [single] hymn, they went out…”
Acts 2:41-42 says, “Those who accepted his message were baptized, and about three thousand were added to their number that day. They devoted themselves to the apostles’ teaching and to the fellowship, to the breaking of bread and to prayer.”
Acts 20:7 says, “On the first day of the week, we came together to break bread. Paul spoke to the people…”
I Timothy 4:13 says, “Devote yourself to the public reading of Scripture, to preaching and to teaching.”
Nothing complicated about it. Just simple worship. Worship the way Jesus and his apostles worshiped. Worship the way God likes it.